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Regulatory Assets and Liabilities - Regulatory Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2022 | Dec. 31, 2021
Regulatory liabilities |  |
Other current liabilities | $ 56.4 | $ 14.3
Regulatory liabilities | 3,735.5 | 3,946.0
Total regulatory liabilities | 3,791.9 | 3,960.3
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,956.6 | 1,998.5
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,260.9 | 1,248.0
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 340.5 | 397.3
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 76.7 | 124.1
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 53.4 | 13.7
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 24.0 | 37.1
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 12.9 | 28.4
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 0.4 | 84.2
Amortization of transmission regulatory liabilities | 81.0 |
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 66.5 | $ 29.0

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities 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 405 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities 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 405 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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