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Income Taxes (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before provision for income taxes | $ 122.4 | $ 160.1 | $ 157.1 | $ 144.2 | $ 141.6 | $ 136.5 | $ 134.7 | $ 118.4 | $ 583.8 | $ 531.2 | $ 474.5
Current provision for income taxes, Federal |  |  |  |  |  |  |  |  | 184.6 | 157.2 | 127.9
Current provision for income taxes, State |  |  |  |  |  |  |  |  | 13.5 | 15.8 | 10.6
Current provision for income taxes |  |  |  |  |  |  |  |  | 198.1 | 173.0 | 138.5
Deferred provision for income taxes, Federal |  |  |  |  |  |  |  |  | (88.4) | 22.4 | 33.7
Deferred provision for income taxes, State |  |  |  |  |  |  |  |  | 2.7 | 1.8 | 1.9
Deferred provision for income taxes |  |  |  |  |  |  |  |  | (85.7) | 24.2 | 35.6
Interest |  |  |  |  |  |  |  |  | 1.2 | 1.2 | 0.7
Unrecognized Tax Benefits, Income Tax Penalties Expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | 1.2 | 1.2 | 0.7
Provision for income taxes |  |  |  |  |  |  |  |  | $ 113.6 | $ 198.4 | $ 174.8

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