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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
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%