Income Taxes - Tax Provision Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current provision
Federal	$ 50.4	$ (14.6)	$ 73.5
State	11.9	1.1	3.1
Foreign	19.5	57.1	28.3
Total current	81.8	43.6	104.9
Deferred provision
Federal	(10.8)	11.4	(67.7)
State	(8.0)	(4.5)	7.6
Foreign	11.7	(0.9)	(1.0)
Total deferred	(7.1)	6.0	(61.1)
Effective income tax provision	$ 74.7	$ 49.6	$ 43.8