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Income Taxes - Reconciliation of Income Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amount [Abstract] |  |  |
Tax provision at U.S. statutory rate | $ 35.6 | $ 32.6 | $ 36.9
Foreign income tax rate differential | 0.7 | (9.0) | (16.2)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 2.7 | (2.5) | 1.1
Domestic production deduction | (2.4) | (0.9) | (1.5)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount | (11.8) | (7.0) | 0.0
Adjustments to valuation allowances | (2.8) | 3.5 | 1.4
Effective income tax rate reconciliation, tax cuts and jobs act of 2017, transition tax on accumulated foreign earnings, amount | 51.4 | 0.0 | 0.0
Other, net | (3.8) | (1.3) | (0.1)
Provision for income taxes | $ 69.6 | $ 15.4 | $ 21.6
Percent [Abstract] |  |  |
Tax provision at U.S. statutory rate | 35.00% | 35.00% | 35.00%
Foreign income tax rate differential | 0.70% | (9.60%) | (15.40%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent | 2.60% | (2.70%) | 1.10%
Domestic production deduction | (2.30%) | (1.00%) | (1.40%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent | (11.70%) | (7.50%) | 0.00%
Adjustments to valuation allowances | (2.80%) | 3.70% | 1.30%
Effective income tax rate reconciliation, tax cuts and jobs act of 2017, transition tax on accumulated foreign earnings, percent | 50.60% | 0.00% | 0.00%
Other, net | (3.50%) | (1.40%) | (0.10%)
Provision for income taxes | 68.60% | 16.50% | 20.50%

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