Travelers Insurance Companies (Travelers) brought a declaratory judgment action against its insured, Penda Corporation (Penda), to determine its responsibilities under a liability insurance policy. After cross-motions for summary judgment, a magistrate judge recommended that Travelers be found to have no duty to defend Penda in a suit for breach of contract and breach of warranty brought by Penda’s customer, U.S. Sample Company (U.S. Sample). Penda objected to the magistrate judge’s recommendation. Nevertheless, the district court held that Travelers had a duty neither to defend Penda nor to indemnify it in the U.S. Sample suit. Penda appeals and, for the following reasons, we reverse in part and vacate in part the judgment of the district court. This case is remanded to the district court for proceedings consistent with this opinion.
I
BACKGROUND
A. Facts
Penda is a Wisconsin company engaged in the business of commercial plastics extrusion. In December 1985, it received an order from its customer U.S. Sample for a number of white, lithograde styrene sheets. U.S. Sample intended to finish these sheets and then use them as display pages in sample books it had contracted to provide to its customer, Joanna Western Mills (Joanna Western). Pursuant to its agreement with U.S. Sample, Penda delivered the sheets to Bruce Offset Company, which U.S. Sample had hired to lithograph and varnish them. Bruce Offset then delivered the sample books to U.S. Sample, which, in turn, affixed color and material swatches to the pages. In March 1986, U.S. Sample began making partial shipments of the completed books to Joanna Western.
In October 1986, Joanna Western informed U.S. Sample that the pages of the sample books had yellowed. As a result, Joanna Western refused to pay for the *826 books unless U.S. Sample agreed to replace the defective sample books and to provide other concessions. Later, U.S. Sample filed suit against Penda and Bruce Offset Company in Illinois state court, claiming that the sheets were “unusable and unacceptable, and were rejected by the intended user, [Joanna Western],” R. 1, Ex. B, Complaint at 1118, and alleging breach of contract and breach of warranty. As relief, U.S. Sample sought, along with costs and attorneys’ fees, (1) $200,000 for loss of foreseeable profit from U.S. Sample’s contract with Joanna Western; (2) $1,000,000 for loss of foreseeable profit on identified future business with Joanna Western; and (3) $1,000,000 for damage to its reputation. R. 1, Ex. B, Complaint at II21.
Penda requested defense of this claim from Travelers, which had previously issued it a comprehensive general liability policy. In its pertinent parts, this policy stated that Travelers
will pay on behalf of [Penda] all sums which [Penda] shall become legally obligated to pay as damages because of ... bodily injury or ... property damage to which this insurance applies, caused by an occurrence, and the Company shall have the right and duty to defend any suit against [Penda] seeking damages on account of such bodily injury or property damage, even if any of the allegations of the suit are groundless, false or fraudu-lent_
R. 1, Ex. A (App. at A-47). The policy defined “property damage” as
(1) physical injury to or destruction of tangible property which occurs during the policy period, including the loss of use thereof at any time resulting therefrom, or (2) loss of use of tangible property which has not been physically injured or destroyed provided such loss of use is caused by an occurrence during the policy period.
R. 1, Ex. A (App. at A-43(a)). Travelers undertook the defense of the suit under a reservation of rights. It took the position that U.S. Sample’s complaint alleged no property damage that would trigger insurance coverage. It later filed a declaratory judgment action in Illinois state court to adjudicate the rights and liabilities of the parties under the policy. Diversity of citizenship exists in the declaratory judgment action, and Penda removed it to the United States District Court for the Northern District of Illinois.
B. District Court Proceedings
After removal, the declaratory judgment action was assigned to a magistrate judge. Both parties filed cross-motions for summary judgment on the question whether Travelers had a duty to defend Penda in the U.S. Sample lawsuit, and Travelers also sought summary judgment on the question of whether it had a duty to indemnify Pen-da. The magistrate judge recommended judgment for Travelers on the question whether it had a duty to defend. The magistrate judge was of the view that U.S. Sample’s complaint against Penda alleged no property damage that would be covered under the insurance policy, but only a loss of profits and reputation damage. The magistrate judge concluded that, under Illinois law, “a claim alleging a loss of use of property or the necessity of scrap[p]ing property as a result of a defective product would bring a complaint under the ambit of property damages_” R.29, Magistrate’s Rec. at 5. However, he found no such allegation in U.S. Sample’s complaint, and instead characterized it as “involving the sale of defective products by the insured, who then attempts to categorize the cost of remedy for those products as property damage.” Id. at 4.
Penda filed an objection to the magistrate’s recommendation. The district court overruled this objection and held that there were no allegations in the complaint from which it reasonably could be inferred
that the lithograde styrene sheets supplied by Penda caused actual damage to property belonging to [U.S. Sample], diminished the value of [U.S. Sample] property, resulted in a loss of use of property, or that [U.S. Sample] sought to recover such losses from Penda. It is clear that [U.S. Sample] is seeking redress, not for damage to its own property, but for the damages resulting from receiving a *827 defective product from Penda, which was not fit for the purpose for which it was sold.
R. 45, Mem.Op. at 11-12. Thus, the district court concluded that Travelers had no duty to defend Penda under the policy. The court also held that, because the duty to defend is broader than the duty to indemnify, Travelers had no duty to indemnify Penda for U.S. Sample’s claim.
II
ANALYSIS
We review de novo a district court’s decision to grant summary judgment.
La Preferida, Inc. v. Cerveceria Modelo, S.A. de C.V.,
A. The Duty to Defend
1. Applicable standards
The Illinois Supreme Court has recently articulated the legal standards that govern an insurer’s duty to defend.
United States Fidelity & Guar. Co. v. Wilkin Insulation Co.,
To determine an insurer’s duty to defend its insured, the court must look to the allegations of the underlying complaints. If the underlying complaints allege facts within or potentially within policy coverage, the insurer is obliged to defend its insured even if the allegations are groundless, false, or fraudulent.... An insurer may not justifiably refuse to defend an action against its insured unless it is clear from the face of the underlying complaints that the allegations fail to state facts which bring the case within, or potentially within, the policy’s coverage .... Moreover, if the underlying complaints allege several theories of recovery against the insured, the duty to defend arises even if only one such theory is within the potential coverage of the policy.... The underlying complaints and the insurance policies must be liberally construed in favor of the insured.
Id.,
It is certainly true that the duty to defend flows in the first instance from the allegations in the underlying complaint; this is the concern at the initial stage of the proceedings when an insurance company encounters the primary decision of whether to defend its insured. However, if an insurer opts to file a declaratory proceeding, we believe that it may properly challenge the existence of such a duty by offering evidence to prove that the insured’s actions fell within the limitations of one of the policy’s exclusions_ The only time such evidence should not be permitted is when it tends to determine an issue crucial to the determination of the underlying lawsuit ... If a crucial issue will not be determined, we see no reason why the party seeking a declaration of rights should not have the prerogative to present evidence that is accorded generally to a party during a motion for summary judgment in a declaratory proceeding. To require the trial court to look solely to the complaint in the underlying action to determine coverage would make the declaratory proceeding little more than a useless exercise possessing no attendant benefit and would greatly diminish a declaratory action’s purpose of settling and fixing the rights of the parties.
Envirodyne’s rule has been made applicable to both parties.
See Charles H. Eichelkraut & Sons, Inc. v. Bituminous Casualty Corp.,
Finally, we note the Illinois Supreme Court’s recent reiteration of the standard we must apply in reviewing both the insurance policy and the pleadings submitted in the underlying litigation:
The underlying complaints and the insurance policies must be liberally construed in favor of the insured. Where a policy provision is clear and unambiguous, its language must be taken in its “plain, ordinary and popular sense.” ... A provision is ambiguous if it is subject to more than one reasonable interpretation.... All doubts and ambiguities must be resolved in favor of the insured.
Wilkin,
2. Application to this case
a.
Travelers first submits that the plain language of U.S. Sample’s complaint states that U.S. Sample seeks only recovery for lost profits on the contract with Joanna Western, lost profits on identifiable future business with Joanna Western, and damage to its reputation. Travelers then argues that these alleged losses are purely eco *829 nomic, 1 and that nowhere does the complaint explicitly attempt to recover for damage to property or persons, which would be within the ambit of policy.
[T]he allegations in the case at bar did not attempt to recover for property damage to the sample books or its component parts. There were no allegations that the styrene sheets supplied by Penda caused actual damage to property belonging to U.S. Sample or diminished the value of [U.S.] Sample’s property or resulted in a loss of use of property.
Appellee’s Br. at 14. Consequently, continues Travelers, because there were no allegations that any injury to property occurred, there is no possibility that Penda could become “legally obligated to pay ... damages because of ... property damage,” and the coverage of the insurance policy would not be implicated.
As we have already noted, in evaluating this argument, we are bound by the Illinois Supreme Court’s teaching, recently reiterated, that, in determining if a duty to defend exists, we must read the underlying complaint liberally and in favor of the insured.
Wilkin,
*830
We do not believe that the present case is controlled by
CMO Graphics, Inc. v. CNA Ins.,
Nor do we believe that Travelers can escape this possible characterization of U.S. Sample’s eomplaint on the ground that the books that were damaged belonged to Joanna Western, and not to U.S. Sample, at the time of the damage and that, consequently, U.S. Sample incurred no damage to its property. Assuming that U.S. Sample did not own the books at the time they were damaged,
3
this argument cannot prevail. First, the policy in question states that it covers liability that the insured is obligated to pay “because of ... property damage.”
See
App. at A-47. It does not state that it applies only to damage to property owned by the plaintiff in the underlying action.
4
Second, Illinois cases do
*831
not consider who owned the property in question when determining if a claim is within policy coverage. For example, in
Elco Industries, Inc. v. Liberty Mutual Insurance Co.,
b.
Alternatively, Travelers claims that, even if U.S. Sample were basing its claim, in part, on damage to the sample books and finished pages, such recovery would not be “property damage” within the definition of the policy. In making this argument, Travelers invokes the well-established rule in Illinois insurance law that “economic losses sustained as a result of defects in or damage to the insured’s own work or product are not covered by a comprehensive general liability insurance policy.”
Ohio Casualty,
*832
Illinois cases make clear that, when an insured causes damage to things other than its own work or product, “property damage” occurs within the scope of the policy.
See Ohio Casualty,
[b]ecause the Grant Park complaint alleges damage to property other than Bazzi’s own work or product, namely the structure of the existing garage, the district court properly concluded that the state court action states a claim for property damage that is potentially within the coverage of the insurance policy.
Id.
at 1148-49. In addition, Illinois cases also indicate that, when a defective product is “so intertwined with the entire mechanism that the defect and [its] subsequent removal necessarily resulted in damage to the completed product,” property damage occurs for the purposes of a general liability policy.
Elco Indus. Inc.,
In this case, the product that allegedly failed was the styrene sheets manufactured by Penda. If the only damage caused was to the sheets, no property damage within the scope of the policy occurred. However, the complaint makes clear that, after Penda supplied the sheets, they were varnished, lithographed, and placed into books. In addition, as part of the finishing process, U.S. Sample attached material swatches to them. Because of the nature of the product that Penda sold, a fair inference is that, if the sheets it provided had to be replaced and discarded, then the varnishing and lithographing, and perhaps the material appended to them, also had to be replaced and discarded. Indeed, the deposition testimony of Mr. Schopp suggests that the yellowing of the sheets required U.S. Sample to make, in some instances, new sample books. R.32, Deposition of David R. Schopp at 91. Consequently, the possibility exists that the alleged defect in Pen-da’s sheets caused the damaging or destruction of components other than those which Penda supplied. Therefore, U.S. Sample’s complaint can be read to allege “physical injury to or destruction of tangible property” that would trigger Travelers’ duty to defend.
In addition, the insurance policy Travelers issued provides an alternative definition of “property damage” as “loss of
*833
use of tangible property which has not been physically injured or destroyed....” In this case, even if the failure of the sheets did not cause physical injury to or destruction of the lithographing, varnish, material, and books, it appears that Joanna Western and U.S. Sample “lost the use” of these components when Penda’s sheets became unusable and had to be replaced. Therefore, it also is possible that “property damage” occurred under this definition of the policy, which would place on Travelers a duty to defend.
See W.E. O’Neil Constr. Co. v. National Union Fire Ins. Co.,
B. The Policy Exclusions
Finally, in a page and a half of its brief, Travelers contends in the most cursory fashion that it has no duty to defend because U.S. Sample’s claim is explicitly precluded by certain exclusions in the insurance policy. We first note that such summary treatment comes dangerously close to waiver of the argument.
See
Fed.R.App.P. 28(a)(5);
Beard v. Whitley County REMC,
Particularly in cases like this one, an insurance company is under an obligation to do more than inundate the district court with arguably applicable policy provisions and force the court to wade through the provisions in an attempt to determine which one might provide an appropriate basis for excluding coverage. For an exclusionary provision to be properly raised before the district court, it is not enough for an insurance company merely to recite it to the court in a long description of the policy; it must explain to the court why the provision is applicable in the case before it and how the provision operates to exclude the disputed claim from coverage under the policy.
Ohio Casualty,
Accordingly, because it cannot be said that U.S. Sample’s complaint is not potentially within the coverage of the insurance policy that Travelers issued Penda, we hold that Travelers has a duty to defend Penda in the underlying action by U.S. Sample. The decision of the district court on this question is reversed.
C. The Duty to Indemnify
The district court held that if Travelers had no duty to defend Penda, it necessarily had no duty to indemnify because, under Illinois law, the duty to defend is broader than the duty to indemnify. Because we have found that Travelers has a duty to defend Penda, Illinois law is clear that the determination of whether Travelers has a duty to indemnify is not ripe until the underlying litigation is terminated.
See Aetna Casualty & Surety Co. v. Prestige Casualty Co.,
Conclusion
For the foregoing reasons, the judgment of the district court is reversed in part and vacated in part. The case is remanded for further proceedings consistent with this opinion. Penda may recover its costs on this appeal.
REVERSED in part, VACATED in part, and Remanded.
Notes
. The Illinois Supreme Court has defined "economic loss” as " ‘damages for inadequate value, costs of repair and replacement of the defective product, or consequent loss of profits — without any claim of personal injury or damage to other property’... as well as ‘the diminution in the value of the product because it is inferior in quality and does not work for the general purposes for which it was manufactured and sold.’’’
Moorman Mfg. Co. v. National Tank Co.,
.
See also United States Fidelity & Guar. Co. v. Specialty Coatings Co.,
. Although the record is not clear, it appears as if U.S. Sample may have "owned" at least a portion of the damaged products. The complaint states that Joanna Western rejected, and U.S. Sample was asked to replace, the damaged sample books. R.1, Ex. B, Complaint at ¶¶ 12, 18.
.
Cf. Specialty Coatings Co.,
.
See also Bituminous Casualty Corp. v. Gust K. Newberg Constr. Co.,
.
See also Marathon Plastics, Inc. v. International Ins. Co., 161
Ill.App.3d 452,
112
Ill.Dec. 816, 821-22,
