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Income Taxes (Reconciliation of Income Tax Rate) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Provision at the U.S. statutory rate of 35% | $ 162.4 | $ 141.0 | $ 98.9
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 | $ 9.2 | $ 12.8 | $ 8.0
Domestic manufacturing deduction | (9.6) | (9.2) | (9.9)
Tax credits, net of unrecognized tax benefits | (8.6) | (27.9) | (0.7)
Change in unrecognized tax benefits | (0.1) | (0.3) | (0.9)
Change in valuation allowance | 6.4 | (4.3) | (0.6)
Foreign taxes at rates other than 35% | (9.0) | (1.3) | 0.3
Deemed inclusions | 0.3 | 16.9 | 0.6
Change in rates from the Tax Act & other law changes | 31.8 | (0.6) | 0.8
Excess tax benefits from stock-based compensation | (23.6) | 0.0 | 0.0
Miscellaneous other | (2.3) | (3.0) | (1.1)
Total provision for income taxes | $ 156.9 | $ 124.1 | $ 95.4

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