Can insurers escape contribution obligations through strategic settlements? Sharon Steel Corp. v. Aetna Casualty & Surety Co. Explained

In a significant ruling addressing insurance defense cost allocation and equitable subrogation, the Utah Supreme Court in Sharon Steel Corp. v. Aetna Casualty & Surety Co. established important principles governing when insurers can seek contribution from co-insurers who fail to pay their fair share of defense obligations.

Background and Facts

UV Industries faced EPA cleanup liability at a Midvale site where mining operations had occurred from 1908-1971. Three insurers—Aetna, Hartford, and AMICO—had issued consecutive comprehensive general liability policies covering UV during overlapping periods. When the EPA sued, Aetna ultimately paid approximately 95% ($10.5 million) of defense costs, while Hartford limited its contribution to 5% and AMICO paid nothing. AMICO and Hartford later settled with the insured for $475,000 and $500,000 respectively, attempting to cut off any contribution obligations to Aetna.

Key Legal Issues

The court addressed whether AMICO had a duty to defend under pollution exclusion clauses, whether Aetna could pursue equitable subrogation against co-insurers, and whether the co-insurers’ settlements with the insured extinguished Aetna’s contribution rights. Additionally, the court examined how to fairly allocate defense costs among multiple insurers with varying policy limits and coverage periods.

Court’s Analysis and Holding

The court held that pollution occurring over 60-70 years as part of normal business operations was not “sudden and accidental” under AMICO’s pollution exclusion, eliminating AMICO’s defense obligation. However, Aetna could pursue equitable subrogation against Hartford for reasonable defense costs exceeding its fair share. Critically, the court ruled that Hartford’s settlement with the insured did not extinguish Aetna’s rights because Hartford had notice of Aetna’s substantial payments and contribution claims.

Practice Implications

This decision establishes that insurers cannot avoid fair contribution obligations through strategic settlements when they have notice of co-insurer payments. The court adopted a policy limits multiplied by years of coverage approach for allocating defense costs, providing important guidance for complex multi-insurer disputes. Practitioners should ensure proper notice procedures are followed and document all co-insurer communications to preserve contribution rights in similar coverage disputes.