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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