Income Taxes - Tax Payments and Refunds (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total income tax (refunds) payments, net [Line Items]
Total income tax refunds, net	$ (39.9)	$ (9.1)	$ (64.0)
U.S. — federal
Total income tax (refunds) payments, net [Line Items]
Total income tax refunds, net	(44.6)	(45.7)	(103.1)
U.S. — state and local
Total income tax (refunds) payments, net [Line Items]
Total income tax refunds, net	1.6	0.3	(1.6)
Non-U.S.
Total income tax (refunds) payments, net [Line Items]
Total income tax refunds, net	$ 3.1	$ 36.3	$ 40.7