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Income Taxes (Schedule Of Principal Components Of Net Deferred Tax Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Liabilities    
Accelerated depreciation and other property differences $ 2,527.9 $ 2,454.4
Other regulatory assets 348.4 308.6
Total Deferred Tax Liabilities 2,876.3 2,763.0
Deferred Tax Assets    
Other regulatory liabilities and deferred investment tax credits (including TCJA) 294.3 284.7
Pension and other postretirement/postemployment benefits 124.7 104.8
Net operating loss carryforward and AMT credit carryforward 491.0 545.9
Environmental liabilities 20.7 22.2
Other accrued liabilities 55.9 42.1
Other, net 43.0 111.7
Total Deferred Tax Assets 1,029.6 1,111.4
Deferred Tax Assets, Valuation Allowance (7.8) (7.8)
Deferred Tax Assets, Net of Valuation Allowance 1,021.8 1,103.6
Net Deferred Tax Liabilities $ 1,854.5 $ 1,659.4