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Income Taxes (Reconciliation of Income Tax Rate) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Provision at the U.S. statutory rate of 35% | $ 141.0 | $ 98.9 | $ 111.2
U.S. statutory rate (as a percent) | 35.00% | 35.00% | 35.00%
Increase (reduction) in tax expense resulting from: |  |  |
State income tax, net of federal income tax benefit | $ 12.8 | $ 8.0 | $ 8.8
Other permanent items | 4.2 | (9.1) | (8.2)
Tax credits, net of unrecognized tax benefits | (27.9) | (0.7) | 0.0
Change in unrecognized tax benefits | (0.3) | (0.9) | 0.2
Change in valuation allowance | (4.3) | (0.6) | 0.2
Foreign taxes at rates other than 35% and miscellaneous other | (1.4) | (0.2) | (2.7)
Total provision for income taxes | $ 124.1 | $ 95.4 | $ 109.5

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