Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 10.9	$ 6.1	$ (33.8)	$ 26.6
Pension plan settlement loss			51.7
Deferred tax benefit from change in foreign tax rate			$ 17.7