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Income Taxes - Components of deferred income taxes (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Non-current |  |
Tax gross up - regulatory items | $ 469.5 | $ 497.6
Future tax benefits | 104.6 | 102.5
Deferred revenues | 97.8 | 104.2
Other | 205.9 | 197.2
Total deferred tax assets | 877.8 | 901.5
Valuation allowance | (1.2) | (2.3)
Net deferred tax assets | 876.6 | 899.2
Non-current |  |
Property-related | 3,909.0 | 3,721.0
Investment in affiliates | 648.6 | 647.2
Deferred costs - plant retirements | 223.9 | 255.4
Employee benefits and compensation | 170.6 | 148.2
Other | 233.0 | 187.2
Total deferred tax liabilities | 5,185.1 | 4,959.0
Deferred tax liability, net | $ 4,308.5 | $ 4,059.8

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