Income Taxes - Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 24.9	$ (12.0)	$ 25.1
Foreign	91.7	77.0	90.0
State	0.7	0.4	(0.4)
Total current	117.3	65.4	114.7
Deferred:
Federal	15.0	(1.2)	(4.4)
Foreign	7.7	42.7	(30.4)
State	10.9	4.6	(9.1)
Total deferred	33.6	46.1	(43.9)
Total	$ 150.9	$ 111.5	$ 70.8

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