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Income Taxes (Reconciliation of Income Tax Rate) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Provision at the U.S. statutory rate of 21% (35% for 2017, 2016) | $ 98.3 | $ 162.4 | $ 141.0
U.S. statutory rate (as a percent) | 21.00% | 35.00% | 35.00%
Increase (reduction) in tax expense resulting from: |  |  |
State income tax, net of federal income tax benefit | $ 15.5 | $ 9.2 | $ 12.8
Domestic manufacturing deduction | 0.0 | (9.6) | (9.2)
Tax credits, net of unrecognized tax benefits | (2.5) | (8.6) | (27.9)
Change in unrecognized tax benefits | 0.4 | (0.1) | (0.3)
Change in valuation allowance | 5.0 | 6.4 | (4.3)
Foreign taxes at rates other than U.S. statutory rate | (3.2) | (9.0) | (1.3)
Deemed inclusions | 3.9 | 0.3 | 16.9
Change in rates from the Tax Act & other law changes | 1.9 | 31.8 | (0.6)
Excess tax benefits from stock-based compensation | (10.5) | (23.6) | 0.0
Miscellaneous other | (1.2) | (2.3) | (3.0)
Total provision for income taxes | $ 107.6 | $ 156.9 | $ 124.1

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