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Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |
Deferred tax liability, net | $ 4,625.6 | $ 4,308.5
Deferred Tax Assets |  |
Tax gross up - regulatory items | 459.0 | 469.5
Future tax benefits | 187.7 | 104.6
Deferred revenues | 86.8 | 97.8
Other | 190.2 | 205.9
Total deferred tax assets | 923.7 | 877.8
Valuation allowance | (1.2) | (1.2)
Net deferred tax assets | 922.5 | 876.6
Deferred Tax Liabilities |  |
Property-related | 4,072.5 | 3,909.0
Investment in affiliates | 839.7 | 648.6
Employee benefits and compensation | 219.5 | 170.6
Deferred costs - plant retirements | 212.8 | 223.9
Other | 203.6 | 233.0
Total deferred tax liabilities | $ 5,548.1 | $ 5,185.1

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