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Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred Tax Assets |  |
Tax gross up - regulatory items | $ 438.6 | $ 459.0
Future tax benefits | 160.7 | 187.7
Deferred revenues | 84.7 | 86.8
Other | 168.3 | 190.2
Total deferred tax assets | 852.3 | 923.7
Valuation allowance | (5.0) | (1.2)
Net deferred tax assets | 847.3 | 922.5
Deferred Tax Liabilities |  |
Property-related | 4,198.0 | 4,072.5
Investment in affiliates | 915.1 | 839.7
Employee benefits and compensation | 227.2 | 219.5
Deferred costs - plant retirements | 199.6 | 212.8
Other | 225.9 | 203.6
Total deferred tax liabilities | 5,765.8 | 5,548.1
Deferred tax liability, net | $ 4,918.5 | $ 4,625.6

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