Income Taxes - Income (Loss) Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
Income (loss) before income taxes, U.S.	$ (129.1)	$ 0.0	$ 169.0
Income (loss) before income taxes, Non-U.S.	109.7	190.9	180.5
Income (Loss) Before Income Taxes	$ (19.4)	$ 190.9	$ 349.5