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REGULATORY ASSETS AND LIABILITIES - REGULATORY ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Regulatory assets
Other current assets	$ 23.6	$ 39.0
Regulatory assets	3,217.4	3,339.7
Total regulatory assets	3,241.0	3,378.7
Plant retirement related items
Regulatory assets
Total regulatory assets	783.8	810.5
Pension and OPEB costs
Regulatory assets
Total regulatory assets	616.5	684.9
Environmental remediation costs
Regulatory assets
Total regulatory assets	522.7	570.1
Income tax related items
Regulatory assets
Total regulatory assets	482.5	438.5
AROs
Regulatory assets
Total regulatory assets	188.7	166.7
Uncollectible expense
Regulatory assets
Total regulatory assets	117.4	151.5
Decoupling
Regulatory assets
Total regulatory assets	101.8	110.0
System support resource
Regulatory assets
Total regulatory assets	95.3	102.9
Securitization
Regulatory assets
Total regulatory assets	69.6	76.5
Bluewater
Regulatory assets
Total regulatory assets	43.0	57.7
Derivatives
Regulatory assets
Total regulatory assets	38.7	38.2
Finance and operating leases
Regulatory assets
Total regulatory assets	31.2	22.0
Energy efficiency programs
Regulatory assets
Total regulatory assets	21.7	26.5
Electric transmission costs
Regulatory assets
Total regulatory assets	20.5	0.4
Other, net
Regulatory assets
Total regulatory assets	$ 107.6	$ 122.3

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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