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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

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