v3.26.1
REGULATORY ASSETS AND LIABILITIES (Tables)
6 Months Ended
Jun. 30, 2026
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule of regulatory assets
(in millions)June 30, 2026December 31, 2025
Regulatory assets
Environmental remediation costs$128.9 $133.5 
Plant retirement related items113.3 122.9 
Income tax related items61.6 59.3 
AROs60.7 49.1 
Electric transmission costs23.8 15.4 
Pension and OPEB costs12.0 19.8 
Finance and operating leases11.8 10.2 
Derivatives7.8 4.8 
Bluewater Natural Gas Holding, LLC6.6 8.7 
Other, net23.0 22.5 
Total regulatory assets$449.5 $446.2 
Schedule of regulatory liabilities
(in millions)June 30, 2026December 31, 2025
Regulatory liabilities
Income tax related items$298.7 $305.9 
Removal costs 226.7 219.4 
Pension and OPEB benefits85.9 85.7 
Energy costs refundable through rate adjustments18.4 11.4 
Derivatives16.8 8.3 
Other, net23.3 24.1 
Total regulatory liabilities$669.8 $654.8 
Balance sheet presentation
Other current liabilities$18.4 $11.4 
Regulatory liabilities651.4 643.4 
Total regulatory liabilities$669.8 $654.8