Income Taxes - Components of Earnings Before Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 328.2	$ 126.7	$ 255.1
Foreign	298.0	243.6	202.7
Earnings before income tax provision	$ 626.2	$ 370.3	$ 457.8