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Income Taxes - Reconciliation of Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amount
Tax provision at U.S. statutory rate	$ 24.5	$ 35.6	$ 32.6
Foreign income tax rate differential	1.0	0.7	(9.0)
State income tax, net of federal benefit	1.7	2.7	(2.5)
Domestic production deduction	0.0	(2.4)	(0.9)
Remeasurement of deferred taxes for tax law change	(1.8)	(11.8)	(7.0)
Adjustments to valuation allowances	(2.5)	(2.8)	3.5
U.S. tax reform transition tax	(11.6)	51.4	0.0
Other, net	(0.6)	(3.8)	(1.3)
Provision for income taxes	$ 10.7	$ 69.6	$ 15.4
Percent
Tax provision at U.S. statutory rate	21.00%	35.00%	35.00%
Foreign income tax rate differential	0.90%	0.70%	(9.60%)
State income tax, net of federal benefit	1.50%	2.60%	(2.70%)
Domestic production deduction	(0.00%)	(2.30%)	(1.00%)
Remeasurement of deferred taxes for tax law change	(1.50%)	(11.70%)	(7.50%)
Adjustments to valuation allowances	(2.10%)	(2.80%)	3.70%
U.S. tax reform transition tax	(10.00%)	50.60%	0.00%
Other, net	(0.60%)	(3.50%)	(1.40%)
Provision for income taxes	9.20%	68.60%	16.50%

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