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Income Taxes (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before provision for income taxes | $ 201.0 | $ 198.4 | $ 198.0 | $ 157.7 | $ 122.4 | $ 160.1 | $ 157.1 | $ 144.2 | $ 755.1 | $ 583.8 | $ 531.2
Current provision for income taxes, Federal |  |  |  |  |  |  |  |  | 110.9 | 184.6 | 157.2
Current provision for income taxes, State |  |  |  |  |  |  |  |  | 19.5 | 13.5 | 15.8
Current provision for income taxes |  |  |  |  |  |  |  |  | 130.4 | 198.1 | 173.0
Deferred provision for income taxes, Federal |  |  |  |  |  |  |  |  | 35.0 | (88.4) | 22.4
Deferred provision for income taxes, State |  |  |  |  |  |  |  |  | 14.3 | 2.7 | 1.8
Deferred provision for income taxes |  |  |  |  |  |  |  |  | 49.3 | (85.7) | 24.2
Interest |  |  |  |  |  |  |  |  | 1.4 | 1.2 | 1.2
Unrecognized Tax Benefits, Income Tax Penalties Expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | 1.4 | 1.2 | 1.2
Provision for income taxes |  |  |  |  |  |  |  |  | $ 181.1 | $ 113.6 | $ 198.4

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