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REGULATORY ASSETS AND LIABILITIES - REGULATORY ASSETS (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Regulatory assets
Other current assets	$ 84.5	$ 39.0
Regulatory assets	3,283.3	3,339.7
Total regulatory assets	3,367.8	3,378.7
Plant retirement related items
Regulatory assets
Total regulatory assets	820.8	810.5
Pension and OPEB costs
Regulatory assets
Total regulatory assets	660.4	684.9
Environmental remediation costs
Regulatory assets
Total regulatory assets	540.7	570.1
Income tax related items
Regulatory assets
Total regulatory assets	446.3	438.5
Asset retirement obligations
Regulatory assets
Total regulatory assets	170.3	166.7
Uncollectible expense
Regulatory assets
Total regulatory assets	133.4	151.5
Decoupling
Regulatory assets
Total regulatory assets	129.1	110.0
System support resource
Regulatory assets
Total regulatory assets	100.4	102.9
Securitization
Regulatory assets
Total regulatory assets	74.3	76.5
Energy costs recoverable through rate adjustments
Regulatory assets
Total regulatory assets	72.2	8.3
Bluewater
Regulatory assets
Total regulatory assets	55.1	57.7
Finance and operating leases
Regulatory assets
Total regulatory assets	26.0	22.0
Energy efficiency programs
Regulatory assets
Total regulatory assets	17.3	26.5
Derivatives
Regulatory assets
Total regulatory assets	7.7	38.2
Other, net
Regulatory assets
Total regulatory assets	$ 113.8	$ 114.4

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