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Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred Tax Assets |  |
Tax gross up - regulatory items | $ 420.1 | $ 438.6
Future tax benefits | 165.4 | 160.7
Deferred revenues | 76.0 | 84.7
Other | 167.9 | 168.3
Total deferred tax assets | 829.4 | 852.3
Valuation allowance | (1.1) | (5.0)
Net deferred tax assets | 828.3 | 847.3
Deferred Tax Liabilities |  |
Property-related | 4,545.2 | 4,198.0
Investment in affiliates | 1,103.9 | 915.1
Employee benefits and compensation | 231.4 | 227.2
Deferred costs - plant retirements | 194.3 | 199.6
Other | 268.2 | 225.9
Total deferred tax liabilities | 6,343.0 | 5,765.8
Deferred tax liability, net | $ 5,514.7 | $ 4,918.5

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