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Income Taxes (Schedule Of Principal Components Of Net Deferred Tax Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Liabilities    
Accelerated depreciation and other property differences $ 1,419.4 $ 1,384.8
Partnership basis differences 1,328.6 1,241.9
Other regulatory assets 210.1 212.1
Total Deferred Tax Liabilities 2,958.1 2,838.8
Deferred Tax Assets    
Other regulatory liabilities and deferred investment tax credits (including TCJA) 170.4 182.2
Pension and other postretirement/postemployment benefits 58.8 58.6
Net operating loss carryforward and AMT credit carryforward 369.4 422.9
Environmental liabilities 12.2 10.1
Other accrued liabilities 43.4 40.3
Other, net 28.7 50.7
Total Deferred Tax Assets 682.9 764.8
Deferred Tax Assets, Valuation Allowance (6.4) (6.4)
Deferred Tax Assets, Net of Valuation Allowance 676.5 758.4
Net Deferred Tax Liabilities $ 2,281.6 $ 2,080.4