This is a review of a decision of the court of appeals reversing a judgment of the circuit court for Milwaukee County, Honorable Patrick J. Madden, Judge, denying a claim by plaintiff, Millers National Insurance Company (Millers National), for subrogation against the City of Milwaukee (City). The circuit court dismissed the action on summary judgment for failure to state a claim upon which relief can be granted. 1 The court of appeals reversed, concluding that the City was obligated to provide uninsured motorist (UM) coverage under sec. 66.189, Stats., 2 and that Millers National could make out a claim for subrogation from the City after payment to its insured, City of Milwaukee police officer Michael McGuire (Officer McGuire), by virtue of the appropriate provisions in its insurance contract. We affirm the court of appeals.
*162 Officer McGuire was operating a city motorcycle in the course of his employment when he was struck and injured by an uninsured motorist on December 24, 1985. Following the accident, Officer McGuire and his attorney contacted the City about a claim under sec. 66.189, Stats., which provides that 1st class cities "shall" provide UM insurance coverage for motor vehicles owned by the city and operated by city employes in the course of employment. Section 632.32(4)(a) requires coverage limits of at least $25,000 per person and $50,000 per accident.
Officer McGuire was informed, however, that the City had no insurance coverage from which to pay him. Owing to the City's response, Officer McGuire then sought collection from his personal insurer, Millers National. Officer McGuire's policy with Millers National contained a UM coverage clause, providing UM coverage as excess insurance if Officer McGuire was injured while operating a vehicle he did not own. 3
Millers National also contacted the City about a claim on behalf of Officer McGuire but was informed that the City had cancelled its UM coverage and had been unable to replace the coverage. A letter addressed to Millers National from the Deputy City Attorney stated: "Please be informed that the City of Milwaukee's uninsured motorist coverage was cancelled on September 14, 1985. The City has been unable to *163 replace that coverage. Accordingly, none was in effect on December 24,1985."
Millers National honored the claim, paying Officer McGuire $42,303.53 for his damages. 4 Subsequently, Millers National made a claim with the City for the amount of $25,000, the minimum amount that must be provided by the City under sec. 66.189, Stats. The City responded that subrogation was not available to Millers National under sec. 66.189. Millers National then brought the present action.
The circuit court dismissed Millers National's claim on summary judgment because it agreed with the City that subrogation was unavailable to Millers National under sec. 66.189, Stats. The circuit court concluded that the City owed its duty under sec. 66.189, only to Officer McGuire and not to Millers National, and therefore Millers National had no remedy against the City. The circuit court did acknowledge that subrogation may be possible as between two insurers, provided one insurer possesses superior equity. However, it denied subrogation to Millers National because it concluded that the City was not a tortfeasor here, and therefore, since both the City and Millers National were secondarily liable to Officer McGuire, there was no superior equity possessed by Millers National which would justify recovery against the City.
The court of appeals reversed, holding that sec. 66.189, Stats, requires the City to provide UM insurance protection on its vehicles. It concluded that the City's responsibility to provide UM insurance coverage is the same whether the City is self-insured or otherwise insured. It reasoned that if the City elects to be self-insured under sec. 66.189, the City will be treated *164 as any other insurer for the purposes of sec. 66.189, and for subrogation purposes. Accordingly, applying the standard rules of subrogation, the court of appeals determined that Millers National was entitled to pursue a claim of contractual subrogation. The City's argument that payment to Millers National would violate the public purpose doctrine was rejected. We affirm the court of appeals.
This case first requires the interpretation of sec. 66.189, Stats., and the application of that statute to a set of undisputed facts. These issues are reviewed independently by this court without deference to the decisions of the circuit or appellate courts.
Ball v. District No. 4 Area Bd.,
Many important issues are not in dispute. The City does not dispute that sec. 66.189, Stats., requires the City to provide UM coverage for its vehicles.
American Family Ins. Co. v. Milwaukee,
The City contends, however, that Millers National is not entitled to subrogation under sec. 66.189, Stats. The City makes several arguments.
The City's first argument is that sec. 66.189, Stats., does not require the City to provide UM insurance coverage when the injury in question is covered by a private insurance policy. According to the City's interpretation, sec. 66.189, was only intended to provide a safety net of UM coverage, filling the gaps in coverage not provided for by private policies. The statute's objective is achieved, the City explains, by limiting the coverage provided by the municipality to those instances when no private coverage exists. If an injured person already has private UM coverage of $25,000 or greater, the City argues, coverage through the municipality is not required. Thus we understand the City to be arguing that Officer McGuire would have the choice to seek the UM coverage from either the City or a private insurer. However, once Officer McGuire had received payment for his injuries from his private insurer, the City would be under no obligation to reimburse the private insurer under subrogation.
*166
We disagree. As the court of appeals correctly concluded in
American Family,
The only issue here is the nature and scope of the duty imposed by sec. 66.189, Stats., upon the City by the statute. The City retains considerable discretion as to how it wishes to comply with this statutory obligation to provide UM insurance coverage. As the court of appeals observed in
American Family,
The fact that the City is self-insured does not diminish its obligation or diminish its answerability in
*167
subrogation. In this context, self-insurance is considered merely another form of insurance.
See, Hillegass v. Landwehr,
The City next argues that Millers National does not qualify for subrogation under the statute. The City claims that there is a rule of statutory subrogation that "a private insurance company cannot maintain a cause of action for equitable or contractual subrogation against a statutorily liable self-insured municipality that was not a tortfeasor." Since the City was not a tortfeasor or wrongdoer in Officer McGuire's accident, the City maintains, it cannot be required to respond in subrogation.
*168
The City claims to derive this rule from the "mob damage" statute, sec. 66.091, Stats.,
7
and the cases construing that statute. In particular, the City cites
Interstate Fire & Casualty Co. v. Milwaukee,
We agree with Millers National. Contrary to what the City alleges, there is no general rule of law or equity that subrogation may be had only against a tortfeasor. It is true that "[t]he purpose of subrogation is to place the loss ultimately on the wrongdoers."
Cunningham v. Metropolitan Life Ins. Co.,
Nor is there any rule that so-called "statutory sub-rogation" may be had only against a tortfeasor or wrongdoer. Statutory subrogation, as the name suggests, is nothing more or less than subrogation arising by operation of statute. As with any right, remedy, or relief provided by statute, subrogation created in this manner would be subject to the terms of the specific statutory provision from which it derives. Accordingly, the subrogation available under any given statute depends upon the particular construction given to that specific statute. If the statute in question provides for subrogation only against a tortfeasor, or only against a specific class of persons, then no subrogation may be had against a party who is not a tortfeasor or is not within the specified class. However, unless some restriction is specified in the statute, there is no rule that subrogation rights created by statute may be had only against the tortfeasor or wrongdoer.
Those cases which have found only limited subro-gation rights, such as
Interstate
and
American Insurance,
are based upon the construction of a specific statute and are therefore limited to applications of that specific statute. Neither
Interstate
nor
American Insurance
stands for the proposition that subrogation is limited to collection from a tortfeasor and only a tortfeasor. To the contrary, this court specifically noted
*170
in
Interstate
that subrogation "has often been applied on behalf of one who has paid for damages caused by a tortfeasor." (citing
Patitucci v. Gerhardt,
Likewise, the opinions in
Hamed v. Milwaukee County,
The question is then whether sec. 66.189, Stats., is so similar to sec. 66.091, Stats., that the cases interpreting the mob damage statute should be applied to *171 the present statute. We conclude they are not sufficiently similar. The mob damage statute and sec. 66.189 are not analogous, and there is no basis for transferring the holdings of those cases construing the mob damage statute to sec. 66.189. Unlike sec. 66.189, the mob damage statute is a direct liability statute. Section 66.091, makes the county (or city) directly liable to the injured parties.
By contrast, sec. 66.189, Stats., does not assess any liability to the municipality. Section 66.189, merely directs "1st class cities" to provide UM insurance coverage for the vehicles owned by those cities. The City's obligation is not predicated on any liability or wrongdoing. The City is merely required to provide insurance coverage. Hence the requirement that the city or county be found the equivalent of a tortfeasor or wrongdoer in Interstate and American Insurance before subrogation would be allowed is confined to that statute, sec. 66.091, Stats.
The City next argues that even if allowed under the statute, subrogation in favor of Millers National would go against equity and public policy. According to the City, Millers National does not deserve subrogation because Millers National did nothing more than pay what it was obligated to pay under contract. Since Millers National collected premiums from Officer McGuire for this UM protection, the City explains, it should not now be guaranteed reimbursement through subrogation against the City. This, the City complains, would constitute a windfall to Millers National. This windfall would result because Millers National would be paid twice, once from Officer McGuire the insured, and again from Officer McGuire the taxpayer.
*172
The City again analogizes to the cases construing the mob damage statute. In
Interstate,
As noted above, however, those decisions are limited to that particular statute and those specific circumstances. Again, the court in
Interstate,
The present case is clearly distinguishable from the cases under the mob damage statute. First, as noted above, in
Interstate
and
American Insurance
the court was faced with an "absolute liability statute" which imposed direct liability onto the municipality and would therefore virtually guarantee recovery to the private insurance companies were subrogation allowed under those circumstances.
See, Interstate,
Second, unlike the situations disfavored in Interstate and American Insurance, Millers National is not insuring the same risk which the City is required to cover. The circuit court assumed that both Millers National and the City were secondarily liable for *173 Officer McGuire's coverage. This was in error. As we concluded above, the City's obligation to provide UM insurance is mandatory and categorical. Nothing in the statute suggests that the City is only secondarily liable or may elect to be so. The City is, therefore, primarily responsible for providing such coverage, and as a self-insurer under sec. 66.189, Stats., the City is the primary insurer.
By contrast, it is clear on the face of Millers National's policy that it provides for excess insurance coverage only. In the "Other Insurance" clause within the "Uninsured Motorists Coverage" provision of Officer McGuire's insurance policy from Millers National, it states: "If there is other applicable similar insurance we will pay only our share of the loss. Our share is the proportion that our limit of liability bears to the total of all applicable limits. However, any insurance we provide with respect to a vehicle you do not own shall be excess over any other collectible insurance." (Emphasis supplied.) Since the City and not Officer McGuire owned the motorcycle which he was driving, we presume that the "Other Insurance" clause would govern and that Millers National would not be responsible for that amount for which other insurers are primarily liable. Therefore it is not correct to suggest that the risk covered by Millers National and the City was the same.
Furthermore, we note that even if the risk covered by Millers National and the City were identical, there may be many reasons to purchase insurance to protect against certain risks (and, correspondingly, to allow subrogation claims) even though the statute provides that the damage must be covered by the municipality. Without necessarily endorsing such conclusions, we note that in an analysis of sec. 66.091, Stats., a Wiscon *174 sin Legislative Council Research Bulletin observed that, "[i]f mob or riot damage insurance is unavailable, private property owners who suffer such damage will be forced to litigate directly against the municipality to recover. In many cases, the cost of litigation may be prohibitive for the individual property owner. Without the availability of insurance, and the risk spreading function it serves, it is possible that many small business owners will be forced to leave inner core, high risk urban areas for low risk districts." Wisconsin Legislative Council Research Bulletin 76-6, "Public Liability for Civil Disturbance Damage," July 20, 1976, p. 14.
The equities in this case favor allowing subrogation to insurers in the position of Millers National. There is no reason in equity for disfavoring the party, otherwise eligible under sec. 66.189, Stats., who looks first to his or her private insurance carrier for speedy reimbursement, or his or her insurance carrier who agrees to pay in full and await later subrogation. Furthermore, as this court expressed in
Jindra,
Finally, the City claims that allowing subrogation against the City in favor of Millers National would violate the public purpose doctrine. The public purpose doctrine, although not recited in any specific clause in the state constitution, is a well-established constitutional doctrine.
Hopper v. Madison,
Ordinarily a municipality lacks standing to challenge the constitutionality of a statute, as the City acknowledges.
City of Madison v. Ayers,
In reviewing a "legislative expenditure of public funds, there is a strong presumption that a legislature's acts are constitutional, and it is the duty of this court, if possible, to construe a legislative enactment as to find it in harmony with constitutional principles."
Hopper,
We note that the City is not claiming that the statute itself is unconstitutional. The City concedes that the requirement that it provide insurance to protect city workers injured in the course of employment is a valid public purpose. The City agrees that payments from the City to city workers injured in the course of their employment would be considered a direct public benefit. The City also acknowledges that the payment of premiums by the City to a private insurance company would be allowed. The City's only complaint is that allowing subrogation against the City after Officer McGuire had been made whole by private insurance would constitute a diversion of public funds to a private purpose without any corresponding public benefit.
We disagree. As explained above, once the City engages in the business of providing insurance coverage under sec. 66.189, Stats., by electing to self-insure, it will be treated as an insurance company for the purposes of that statute. It follows that this includes the obligation to pay claims when appropriate and, if applicable, being subject to the normal rules of subrogation.
We conclude, therefore, that Millers National may make out a claim for subrogation against the City. Since this issue is addressed solely for summary judgment purposes, we do not reach the question of whether Millers National's claim for subrogation will ultimately be successful. Subrogation may be based upon either contract or equitable principles.
Jindra,
By the Court. — The decision of the court of appeals is affirmed and cause remanded for further proceedings not inconsistent with this opinion.
Notes
See, sec. 802.06(2), Stats., which provides in relevant part:
802.06 Defenses and objection; when and bow presented; by pleading or motion; motion for judgment on the pleadings ... (2) How Presented. If on a motion asserting the defense described in f) to dismiss for failure of the pleading to state a claim upon which relief can be granted .. matters outside of the pleadings are presented to and not excluded by the court, the motion shall be treated as one for summary judgment and disposed of as provided in s. 802.08 ....
See also, Prah v. Maretti,
Section 66.189, Stats, provides:
66.189 Uninsured motorist coverage; 1st class cities. A 1st class city shall provide uninsured motorist motor vehicle liability insurance coverage for motor vehicles owned by the city and operated by city employes in the course of employment. The coverage required by this section shall have at least the limits prescribed for uninsured motorist coverage under s. 632.(4)(a).
Section 632.32(4)(a) requires coverage limits of at least $25,000 per person and $50,000 per accident.
In the "Other Insurance" clause within the "Uninsured Motorists Coverage" provision of Officer McGuire's insurance policy from Millers National, it states: "If there is other applicable similar insurance we will pay only our share of the loss. Our share is the proportion that our limit of liability bears to the total of all applicable limits. However, any insurance we provide with respect to a vehicle you do not own shall be excess over any other collectible insurance." (Emphasis supplied.)
This figure was arrived at under arbitration provided for in the policy.
The City represented in oral argument that the City, as part of the City's self-insurance plan, had set the amount of coverage the City would supply at $25,000, to comply with sec. 66.189, Stats.
It is irrelevant that private insurance policies may have been either unavailable to, or considered undesirable by, the City.
See, American Family,
Section 66.091, Stats., provides in relevant part:
66.091 Mob damage. (1) A county shall be liable for injury to person or property by a mob or riot therein except when cities are liable. Within a city, the city shall be liable for such injury except
The court of appeals in
Dailey,
The City cites to
Wisconsin Keeley Institute Co. v. Milwaukee County,
