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Regulatory Assets and Liabilities - Plant Retirements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory assets |  |
Regulatory asset | $ 3,367.1 | $ 3,544.1
Deferred tax liabilities | 3,909.0 | 3,721.0
Securitization |  |
Regulatory assets |  |
Regulatory asset | 100.7 | $ 105.2
Edgewater Unit 4 |  |
Regulatory assets |  |
Regulatory asset | 3.6 |
Pleasant Prairie power plant |  |
Regulatory assets |  |
Net book value of retired plant | 585.7 |
Deferred unprotected tax benefits | 18.5 |
Regulatory asset | 567.2 |
Deferred tax liabilities | 164.1 |
Pleasant Prairie power plant | Securitization |  |
Regulatory assets |  |
Regulatory asset | 100.0 |
Presque Isle power plant |  |
Regulatory assets |  |
Net book value of retired plant | 163.3 |
Deferred unprotected tax benefits | 5.6 |
Regulatory asset | 157.7 |
Deferred tax liabilities | 46.7 |
Pulliam power plant |  |
Regulatory assets |  |
Regulatory asset | $ 38.0 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount of previously deferred unprotected tax benefits related to the Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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