Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Effective tax rate	13.60%	15.30%	2.50%	10.00%
Net unrecognized tax benefit	$ 97.0		$ 97.0		$ 74.7
Unrecognized tax benefits that would impact effective tax rate	83.4		83.4
Income tax interest accrued	1.4		1.4
Net deferred tax assets	$ 192.5		$ 192.5