Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current tax expense:
Federal		$ 63.1	$ (14.2)	$ 62.3
State and local		17.2	5.6	4.6
Foreign		106.6	69.9	64.1
Total current expense		186.9	61.3	131.0
Deferred tax expense (benefit):
Federal		9.6	59.4	(19.0)
State and local		6.9	11.8	4.0
Foreign		21.6	9.6	(39.4)
Total deferred tax expense (benefit)	$ (49.0)	38.1	80.8	(54.4)
Total income tax provision		$ 225.0	$ 142.1	$ 76.6