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Income Taxes (Schedule Of Income Tax Provision) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before provision for income taxes | $ 125.9 | $ 117.9 | $ 117.4 | $ 113.3 | $ 116.4 | $ 115.3 | $ 109.2 | $ 80.0 | $ 474.5 | $ 420.9 | $ 398.2
Current provision for income taxes, Federal |  |  |  |  |  |  |  |  | 127.9 | 90.9 | 128.4
Current provision for income taxes, State |  |  |  |  |  |  |  |  | 10.6 | 7.3 | 7.4
Current provision for income taxes |  |  |  |  |  |  |  |  | 138.5 | 98.2 | 135.8
Deferred provision for income taxes, Federal |  |  |  |  |  |  |  |  | 33.7 | 52.0 | 8.7
Deferred provision for income taxes, State |  |  |  |  |  |  |  |  | 1.9 | 4.1 | 0.1
Deferred provision for income taxes |  |  |  |  |  |  |  |  | 35.6 | 56.1 | 8.8
Interest |  |  |  |  |  |  |  |  | 0.7 | 0.4 | 0.5
Unrecognized Tax Benefits, Income Tax Penalties Expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | 0.7 | 0.4 | 0.5
Provision for income taxes |  |  |  |  |  |  |  |  | $ 174.8 | $ 154.7 | $ 145.1

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