Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective Income Tax Rate Reconciliation, Percent	30.70%	36.40%
Provision for (benefit from) income taxes	$ (10.9)	$ (24.8)
Effective Income Tax Rate Reconciliation, GILTI, Amount		$ 5.9
Deferred Tax Assets, Tax Credit Carryforwards, Gross of UTB	301.2
Minimum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	3.0
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 5.0