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Income Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Non-current |  |
Tax gross up - regulatory items | $ 497.6 | $ 519.8
Deferred revenues | 104.2 | 106.3
Future tax benefits | 102.5 | 101.0
Other | 197.2 | 159.8
Total deferred tax assets | 901.5 | 886.9
Valuation allowance | (2.3) | (2.3)
Net deferred tax assets | 899.2 | 884.6
Non-current |  |
Property-related | 3,721.0 | 3,609.0
Investment in affiliates | 647.2 | 531.7
Deferred costs - Plant retirements | 255.4 | 232.0
Employee benefits and compensation | 148.2 | 131.4
Other | 187.2 | 149.8
Total deferred tax liabilities | 4,959.0 | 4,653.9
Deferred tax liability, net | $ 4,059.8 | $ 3,769.3

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