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Income Taxes (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before provision for income taxes | $ 216.1 | $ 318.4 | $ 127.8 | $ (112.8) | $ 215.2 | $ 219.1 | $ 215.3 | $ 206.3 | $ 549.5 | $ 855.9 | $ 755.1
Current provision for income taxes, Federal |  |  |  |  |  |  |  |  | 53.8 | 94.1 | 110.9
Current provision for income taxes, State |  |  |  |  |  |  |  |  | 6.6 | 18.7 | 19.5
Current provision for income taxes |  |  |  |  |  |  |  |  | 60.4 | 112.8 | 130.4
Deferred provision for income taxes, Federal |  |  |  |  |  |  |  |  | 57.3 | 70.7 | 35.0
Deferred provision for income taxes, State |  |  |  |  |  |  |  |  | 11.0 | 14.8 | 14.3
Deferred provision for income taxes |  |  |  |  |  |  |  |  | 68.3 | 85.5 | 49.3
Interest |  |  |  |  |  |  |  |  | (0.2) | 1.5 | 1.4
Unrecognized Tax Benefits, Income Tax Penalties Expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | (0.2) | 1.5 | 1.4
Provision for income taxes |  |  |  |  |  |  |  |  | $ 128.5 | $ 199.8 | $ 181.1

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