Income Taxes - Narrative (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 income tax rate	12.60%	13.80%	20.80%	9.40%
Liability for unrecognized tax benefit	$ 23.0		$ 23.0		$ 20.8
Unrecognized tax benefit highly certain	$ 2.7		$ 2.7		$ 2.7