Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Provision for Income Taxes
Income tax expense (benefit)	$ 27.5	$ 2.9
Effective tax rates (as a percent)	32.20%	21.50%
Unrecognized tax benefits, excluding penalties and interest	$ 24.3		$ 22.7
Accrued interest and penalties related to uncertain tax positions	$ 1.9		$ 1.8
Statutory tax rate (as a percent)	21.00%
Change in tax rate - foreign jurisdictions (as a percent)	5.10%
Germany
Provision for Income Taxes
Statutory tax rate (as a percent)	30.00%
Switzerland
Provision for Income Taxes
Statutory tax rate (as a percent)	20.00%