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Income Taxes (Schedule Of Principal Components Of Net Deferred Tax Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Liabilities    
Accelerated depreciation and other property differences $ 2,454.4 $ 2,339.3
Other regulatory assets 308.6 331.8
Total Deferred Tax Liabilities 2,763.0 2,671.1
Deferred Tax Assets    
Other regulatory liabilities and deferred investment tax credits (including TCJA) 284.7 287.8
Pension and other postretirement/postemployment benefits 104.8 118.1
Net operating loss carryforward and AMT credit carryforward 545.9 608.5
Environmental liabilities 22.2 22.6
Other accrued liabilities 42.1 41.5
Other, net 111.7 128.4
Total Deferred Tax Assets 1,111.4 1,206.9
Deferred Tax Assets, Valuation Allowance (7.8) (6.4)
Deferred Tax Assets, Net of Valuation Allowance 1,103.6 1,200.5
Net Deferred Tax Liabilities $ 1,659.4 $ 1,470.6