Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
Foreign earnings at rates different than U.S. federal rate	(1.50%)	(5.70%)	(1.50%)
Valuation allowance adjustments	(16.80%)	(40.80%)	(6.50%)
Impact of U.S. Tax Reform	(3.10%)	4.30%	0.00%
Other	(3.50%)	0.80%	(0.90%)
Effective income tax rate	(3.90%)	(6.40%)	26.10%
Tax Cuts and Jobs Act of 2017, Change in tax rate, deferred tax asset, income tax expense (benefit)	$ 92.9	$ 49.7