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Summary of Significant Accounting Policies - Summary of Components of Benefit Obligation (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Regulatory Assets, Noncurrent | $ 524.3 | $ 1,230.8
Pension Plan [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 110.0 | 89.6
Other Postretirement Benefits Plan [Member] | Prior Service Cost [Member] |  |
Components of Benefit Obligation Regulatory Asset | 0.0 | (3.6)
Other Postretirement Benefits Plan [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 9.7 | 23.2
Benefit obligations regulatory asset [Member] |  |
Regulatory Assets, Noncurrent | $ 119.7 | $ 109.2

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- Definition Components of Benefit Obligation Regulatory Asset + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + 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 https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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