Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective Income Tax Rate Reconciliation, Percent			(26.00%)	26.90%
Income Tax Reconciliation Prior Year GILTI HTE	$ 23.0		$ 23.0
Provision for (benefit from) income taxes	30.2	$ (27.3)	8.1	$ (57.0)
Deferred Tax Assets, Tax Credit Carryforwards, Gross of UTB	$ 315.5		$ 315.5		$ 302.5