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REGULATORY ASSETS AND LIABILITIES - REGULATORY ASSETS (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Regulatory assets
Other current assets	$ 12.7	$ 20.9
Regulatory assets	3,566.1	3,506.7
Total regulatory assets	3,578.8	3,527.6
Pension and OPEB costs
Regulatory assets
Total regulatory assets	1,042.5	1,066.6
Plant retirements
Regulatory assets
Total regulatory assets	851.5	856.4
Environmental remediation costs
Regulatory assets
Total regulatory assets	686.4	685.5
Income tax related items
Regulatory assets
Total regulatory assets	457.6	457.8
Asset retirement obligations
Regulatory assets
Total regulatory assets	188.8	137.5
SSR
Regulatory assets
Total regulatory assets	140.5	151.5
Uncollectible expense
Regulatory assets
Total regulatory assets	83.4	52.2
Derivatives
Regulatory assets
Total regulatory assets	31.8	33.8
We Power generation
Regulatory assets
Total regulatory assets	18.7	25.8
Other, net
Regulatory assets
Total regulatory assets	$ 77.6	$ 60.5

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