Opinion for the Court filed by Circuit Judge KAVANAUGH.
This case arises out of negotiations between E.I. du Pont de Nemours and Company and the Union that represents employees at one of the Company’s factories in New York. In 2001, the Company declared impasses with respect to two sets of negotiations, one concerning the subcontracting of certain positions and one concerning the parties’ overall collective bargaining agreement. The National Labor Relations Board determined that the Company had permissibly declared an impasse with respect to the overall collective bargaining agreement but had wrongfully declared an impasse with respect to the subcontracting negotiations. Both the Company and the Union filed petitions for review in this Court. The Union contends that the Company impermissibly bifurcated the subcontracting issue and the overall collective bargaining agreement issues into two separate sets of negotiations, and that because the subcontracting impasse was unlawful, so too the collective bargaining agreement impasse was unlawful. The Company argues, contrary to the conclusion of the Board, that there was a lawful impasse on the subcontracting issue. For the reasons set forth below, we deny the petitions for review and grant the Board’s cross-petition for enforcement.
I
1. At its facility in Tonawanda, New York, E.I. du Pont de Nemours and Company manufactures Corian “shapes.” Co-rian is a “solid surface” material used to make countertops in kitchens and other areas. At the Tonawanda facility, liquid Corian is poured into molds in the shapes of bowls and sinks. Employees called “millers” then remove the outer layer from the shapes and drill drain holes. After that, employees called “finishers” sand the shapes to smooth them out and remove blemishes. Along with the rest of the employees at the Tonawanda facility (approximately 400 in all), these millers and finishers are represented by the Union.
In 1977, the Company and the Union signed a collective bargaining agreement. * The CBA included an “evergreen” clause, which permitted either party to terminate or propose alterations to the agreement at *1313 any time. Sixteen years later, in 1993, the Company invoked that clause and notified the Union that it intended to terminate the CBA and negotiate a new agreement. After a year of unfruitful negotiations over a new CBA, the Company declared an impasse in 1994 and implemented its final offer.
Two features of that final offer are relevant to this case. First, the Company eliminated “pyramiding,” an overtime pay system in which employees are eompensát-ed at the overtime rate both for hours worked per day in excess of eight hours and for hours worked per week in excess of 40 hours. Second, the Company eliminated most available healthcare plans and implemented a cost-sharing formula to gradually equalize Company and employee contributions to healthcare costs.
In response to the Company’s implementation of its final offer, the Union filed unfair labor practice charges with the NLRB. In 1997, however, the Company and the Union entered into a settlement agreement, in which the Company agreed to restore pyramiding and freeze healthcare cost-sharing at the ratio that existed as of 1996. The parties resumed negotiations over a new CBA in 1998.
Meanwhile, in 1995, after the Company declared the impasse on the CBA negotiations but before the parties reached the settlement agreement, the parties began a separate set of negotiations concerning the discrete issue of finishing work (the sanding of Corian shapes performed by finishers). Since 1985, the Company had subcontracted finishing work off premises. The Company announced in early 1995, however, that it intended to bring finishing work back in-house. In August of that year, the parties reached an agreement— even though negotiations on the overall CBA were at that time stalled — in which the Company promised to keep 85% of finishing work in-house and the Union accepted a lower wage requirement for finishing work. That agreement was called the “CCMC finisher agreement.”
To summarize, by 1997 the Company and the Union had entered into two agreements relevant to this case. The first was a settlement agreement that preserved negotiations over the overall CBA by restoring pyramiding and freezing the ratio of healthcare cost-sharing at the 1996 level. The second was the CCMC finisher agreement, which related to the discrete issue of bringing finishing work in-house.
2. From 1998 to 2001, the parties continued to bargain over a new CBA. In January 2001, the Company presented the Union with another final offer in the CBA negotiations. That final offer, like the one in 1994, would have eliminated pyramiding and resumed the gradual phase-in of healthcare cost-sharing. At the same time, the Company proposed a “Supplemental Agreement” that amended the CCMC finisher agreement. That amendment would have committed the Company to gradually raising the wages of finishers but would have eliminated the requirement that the Company keep a minimum percentage of finishing work in-house. ■
In February 2001, the Company changed course and informed the Union that it would terminate the CCMC finisher agreement in June of that year. The Company told the Union that emerging technologies would soon make it possible to completely eliminate all finishing positions, as well as milling positions. In response to this, the Union presented a “helping hands” proposal that would purportedly have alleviated some of the bottleneck problems at the factory, but the Company rejected it. The Company also insisted that negotiations over the CCMC finisher agreement be kept separate from negotiations over the CBA.
*1314 In April 2001, the Company informed the Union that it had conducted a feasibility study; the study demonstrated that the Company could save $1 million per year by subcontracting finishing and milling work. As a result, the Company would subcontract all of the finishing and milling work by May 1 unless the Union submitted a plan with comparable cost savings. Throughout April, the Union submitted information requests to the Company concerning the basis for the $1 million cost-savings figure, most of which the Company complied with.
On April 12, the Company declared an impasse on the CBA negotiations and implemented its final offer eliminating pyramiding and gradually equalizing healthcare cost-sharing. Then, on May 1, the Company declared an impasse on the subcontracting negotiations and began to subcontract finishing and milling work.
3. Before the NLRB, the Union challenged the legality of the two impasses under Sections 8(a)(1) and 8(a)(5) of the National Labor Relations Act.
See
29 U.S.C. § 158(a)(1), (5). In February 2006, the Board ruled (as relevant here): (1) the Company had wrongfully failed to provide information in response to seven specific requests by the Union on April 23, 2001, and this failure rendered the impasse on the subcontracting issue unlawful; (2) the Company had not violated the duty to bargain in good faith by insisting on separate negotiations over the subcontracting issue and the CBA; and (3) the Company’s implementation after impasse of its plan to gradually equalize healthcare costs did not confer upon the Company such open-ended discretion as to be unlawful.
See E.I. du Pont de Nemours & Co.,
The Company and the Union filed timely petitions for review in this Court, with the Company challenging the Board’s first holding and the Union challenging the other two holdings. The Board filed a cross-petition for enforcement. We must uphold the Board’s decisions if its factual findings are supported by substantial evidence and the decisions are not arbitrary and capricious.
Carpenters & Millwrights, Local Union 2471 v. NLRB,
II
1. The Company argues that its refusal to provide the Union with information in response to seven specific requests did not preclude a lawful impasse on the subcontracting issue, contrary to the Board’s decision. In the Company’s view, NLRB precedent requires the Board to find a “causal connection” between the refused information requests and the impasse — beyond the fact that the information requests were relevant to the central issues on the table' — such as specific evidence that the Union would have formed a counterproposal had the Company granted the information requests. Therefore, the Company argues, the Board unreasonably departed from its own precedent by declaring the impasse invalid.
The Company’s objection to the Board’s decision is wrong both factually and legally.
As a factual matter, the Board clearly
did
find some causal connection between the denied information requests and the impasse. The Board explained that “[i]n order to assess the accuracy of the [Com
*1315
pany’s] claims [about cost savings], it was necessary for the Union to examine the data that formed the basis for the [Company’s] conclusions.” Decision and Order at 5-6. The Board found that at least one request was both “relevant and essential to the Union’s ability to assess the [Company’s] assertion that [certain] costs constituted 40 percent of its labor costs.”
Id.
at 6. As to the other six requests, the ALJ determined that they were “necessary and relevant in order for the Union to either assess, or understand, the feasibility study, or formulate its own proposals,” and the Board adopted this finding.
E.I. du Pont de Nemours & Co.,
JD-138-03, at 22,
As a legal matter, although the Board has consistently suggested the necessity for some causal connection between an unfair labor practice and an interruption in bargaining before declaring impasse, the Board has never required the establishment of “but for” causation in absolute terms. The Board has, however, repeatedly reiterated the principle that “a finding of valid impasse is precluded where the employer has failed to supply requested information
relevant to the core issues separating the parties.” Caldwell Mfg. Co.,
346 N.L.R.B. No. 100, at 12 (2006) (emphasis added);
see also Titan Tire Corp.,
The Company points to
Alwin Manufacturing Co. v. NLRB,
Likewise, in
Sierra Bullets,
the Board considered the “precise issue” of “whether the mere existence of any information request,
regardless of its relevance to the core issues
that separate the parties at the bargaining table, precludes a finding of impasse.”
In sum, Board and court precedents reflect the principle that a denial of “information relevant to the core issues separating the parties” can preclude a lawful impasse, and such a commonsense principle is certainly reasonable. In this case, moreover, the Board expressly and repeatedly stated that it believed that the Union’s seven information requests were “necessary” and “essential” to the bargaining over the subcontracting issue. We therefore reject the Company’s “causal connection” challenge.
2. The Company also argues that the information requests by the Union do not meet the standard of relevance established by the Board. In the Company’s view, “any discrepancies between the information provided and that later demanded by the Union in the seven requests at issue are so small” that the Union had “an adequate basis to evaluate [the Company’s] claims.” Company Pet’r’s Br. at 54.
The Board’s relevance standard is “a liberal discovery-type standard, under which the requested information need only be relevant to the union in its negotiations.”
U.S. Testing Co.,
The thrust of the Board’s relevance finding in this case was that the Company provided the Union with only “generalized or bundled figures” to support its $1 million cost-saving assertions and therefore the Union properly requested the hard data that the Company used to arrive at its figures. Decision and Order at 5. In the Board’s judgment, “it was necessary for the Union to examine the data that formed the basis for the [Company’s] conclusions.” Id. at 5-6. For example, to respond to the Company’s claim that 40% of its labor costs were attributable to employee benefits, the Union requested the cost data for benefits of finishing and milling employees. See id. at 6. Similarly, the Union requested information on the number of Corian bowls of each style and color finished in-house versus off-site in order to determine whether the Company had purposefully been manufacturing the most labor-intensive kinds of bowls in-house in order to skew upward the in-house costs. See id.
The Board’s relevance finding here was a reasonable application of the well-established NLRB principle that a union is entitled to inspect the data relied on by an employer and does not have to accept the employer’s bald assertions or generalized figures at face value.
See, e.g., Republic Die & Tool Co.,
3. Before this Court, the Company also suggests that the Board’s remedy in this case — an order to reinstate the finishing and milling employees — imposes an “undue burden.”
See Vico Prods. Co. v. NLRB,
HI.
1. In its petition for review, the Union argues that the Board unreasonably approved the Company’s separation of the subcontracting negotiations from the overall CBA negotiations. In the Union’s view, the impasse in the CBA negotiations could have been averted had the Union been able to bargain over the CBA issues and the. subcontracting issue together.
As a general matter, with respect to mandatory subjects of bargaining, a party has the right to insist on negotiating an entire contract rather than engaging in piecemeal negotiation over particular issues. ' As the Board has stated, it “is well settled that the statutory purpose of requiring good-faith bargaining would be frustrated if parties were permitted, or indeed required, to engage in piecemeal bargaining.”
E.I. Dupont de Nemours & Co. (Spruance),
The Union contends that this case is indistinguishable from a previous case involving the same company. In
Spruance,
as in this case, the Company insisted that negotiations on two specific issues take place separately from negotiations on an overall collective bargaining agreement.
We conclude that the Board reasonably distinguished its precedent in Spruance. In that case, the parties did not have a history of separate bargaining over the two issues. On the contrary, the employer negotiated with the union over those proposals at the same sessions where the CBA was discussed, see id at 793, and, far from accepting bifurcation, the union insisted that the proposals were part of the CBA negotiations, see id at 794. In this case, by contrast, there was a long history of separate negotiations between the Company and the Union with respect to the subcontracting issue (as well as other discrete issues). Here, the CBA’s “evergreen” clause permitted the parties to negotiate components of the contract while the balance of the contract’s terms remained in effect. As the Board found, “[t]he parties utilized this clause throughout the life of the contract, negotiating and implementing new terms in discrete areas, such as bonuses, wage increases, and health benefits.” Decision and Order at 4. Of specific relevance to this case, “the issue of subcontracting the milling and finishing work ... was historically separate” from “general bargaining [and] was not even in the unit, i.e., it was subcontracted, for about 10 years.” Id After all, the original CCMC finisher agreement was “proposed, negotiated, and implemented separate and apart from the rest of the contract” — during a period when overall CBA negotiations were stalled. Id Additionally, the CCMC finisher agreement included its own, separate termination clause. Whereas the CBA could be terminated upon notice by either party 60 days prior to its expiration date, the CCMC finisher agreement could not be terminated unless a party gave 120 days notice. Furthermore, there were different committees to bargain over the two sets of issues: a “contract committee” negotiated CBA issues, while issues related to the CCMC finisher agreement were discussed by the “executive board.”
Moreover, not only did the Union not insist on unified bargaining, since “1995, i.e., at the very inception of the in-house milling and finishing work, the parties ... willingly bargained separately for that operation.” Id And while “the Union subsequently made a proposal to retain” the milling and finishing operation, “it never protested on the ground that the negotiations were separate.” Id The Board’s finding that “the issue of subcontracting the milling and finishing work ... was historically separate” from “general bargaining,” id, was supported by substantial evidence. In light of that history, its determination that the present case fell outside of its general rule against bifurcated negotiations was reasonable.
The Board concluded that this history of separation demonstrates that the Company did not insist on bifurcated negotiations in order to distort the bargaining process; the Company simply adhered to the parties’ longstanding practice of separate negotiations. The Board’s judgment was reasonable. Whether a party has bargained in good faith is assessed by looking to the totality of the circumstances.
See NLRB v. Cauthorne,
2. According to the Union, had it been given more time and information to formulate a cost-saving plan in response to the Company’s feasibility study on subcontracting, the Union could have prevented the impasse in the CBA negotiations by coming up with a “horse trade” linking the two sets of issues. In light of our holding that the Board reasonably found that bifurcation was lawful, however, we reject this argument. The Company permissibly kept the two sets of negotiations separate, and therefore the Company could properly declare a lawful impasse in the CBA negotiations even though it could not declare a lawful impasse in the subcontracting negotiations.
3. Finally, the Union argues that, even assuming a valid impasse existed, the Company’s implementation of its healthcare cost-sharing proposal was improper. As a general matter, a lawful impasse entitles an employer to implement the “last, best offer” it presented in negotiations.
Detroit Typographical Union No. 18 v. NLRB,
The Union contends in particular that a provision in the new healthcare plan gives the Company too much discretion in making future changes to employees’ healthcare plans. That provision states: “Participants will pay for premiums, co-pays, co-insurance and deductibles established for a particular plan year.... Projected increases for future plan years will be shared equally between Du Pont and participants, provided, however, such increases may be allocated to premiums, components of plan design, or any combination thereof.” Therefore, the Company and the employees must share any future increase in healthcare costs equally, but the Company has discretion to allocate those costs among premiums and other components of the healthcare plan as the Company sees fit. The Union seizes on this comparatively small measure of employer- discretion, claiming that it violates the McClatchy Newspapers principle and that therefore the Board has unreasonably departed from its own precedent by upholding the Company’s implementation of the healthcare proposal.
*1320
We disagree with the Union because the Board reasonably distinguished this case from its precedents. The Board explained that in prior cases where the Board invalidated employer implementations after impasse, the employer had implemented a “broad discretionary provision.” Decision and Order at 8. For example, in
McClatchy Newspapers,
the employer had implemented a “merit pay” clause that gave it unlimited discretion to decide all future pay increases.
Id.
(citing
McClatchy Newspapers,
In
Detroit Typographical Union,
where we held that the Board had unreasonably applied
McClatchy Newspapers
to preclude an employer from implementing a wage proposal, we made clear that even “a good deal of [employer] discretion” is insufficient to invalidate an employer’s implementation of a proposal after impasse.
We deny the petitions for review and grant the Board’s cross-petition for enforcement.
So ordered.
Notes
The employees at the Tonawanda facility were represented by the Buffalo Yerkes Union until 1999. At that point, the Buffalo Yerkes Union affiliated with the Paper, Allied Industrial, Chemical and Energy Workers International Union, the predecessor to the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union, one of the petitioners in this case. For ease of reference, we refer simply to "the Union.”
