Income Taxes - Reconciliation of Statutory Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation in dollars [Abstract]
Statutory U.S. federal income tax	$ 55.8	$ 34.6	$ 75.4
State income taxes, net of federal benefit	8.7	1.8	(0.6)
Foreign tax differential	2.1	2.5	(11.9)
Change in valuation allowances	(8.6)	(17.7)	5.6
Uncertain tax positions and interest	2.4	33.1	(1.0)
Subpart F income	11.0	6.6	2.7
Manufacturing deduction	0.0	0.0	(1.9)
Remeasurement of deferred taxes	0.0	0.0	(69.7)
Transition Tax	0.0	(6.8)	45.9
Permanent and other	3.3	(4.5)	(0.7)
Effective income tax provision	$ 74.7	$ 49.6	$ 43.8
Reconciliation in percentages [Abstract]
Statutory U.S. federal income tax (percentage)	21.00%	21.00%	35.00%
State income taxes, net of federal benefit (percentage)	3.30%	1.10%	(0.30%)
Foreign tax differential (percentage)	0.80%	1.50%	(5.50%)
Change in valuation allowance (percentage)	(3.20%)	(10.70%)	2.60%
Uncertain tax positions (percentage)	0.90%	20.10%	(0.50%)
Subpart F income (percentage)	4.10%	4.00%	1.20%
Manufacturing deduction (percentage)	0.00%	0.00%	(0.90%)
Tax reform tax rate change (percentage)	0.00%	0.00%	(32.30%)
Transition Tax (percentage)	0	(0.041)	0.213
Permanent and other (percentage)	1.20%	(2.80%)	(0.30%)
Effective income tax provision (percentage)	28.10%	30.10%	20.30%