Income Taxes - Earnings Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 496.8	$ 510.9	$ 460.7
Non-U.S.	(36.5)	54.9	46.6
Earnings before income taxes	$ 460.3	$ 565.8	$ 507.3