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
Income Tax Contingency [Line Items]
Effective tax rate	15.30%	(150.50%)	10.00%	(42.30%)
Tax benefit attributable to the 2015 U.S. federal income tax return statute of limitations closing		$ 17.3		$ 17.3
Net unrecognized tax benefit	$ 75.0		$ 75.0		$ 84.5
Unrecognized tax benefits that would impact effective tax rate	63.0		63.0
Income tax interest and penalties accrued	3.9		3.9
Net deferred tax assets	$ 393.9		$ 393.9
Swiss Federal Tax Administration (FTA) [Member]
Income Tax Contingency [Line Items]
Income tax benefit due to recognition of Swiss deferred tax assets		$ 157.7		$ 157.7