Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ (11.9)	$ (81.5)	$ 87.1
State and local	0.1	3.2	(0.7)
Foreign	49.3	46.5	62.4
Total current	37.5	(31.8)	148.8
Deferred
Federal	(73.5)	(5.1)	(122.3)
State and local	(1.5)	(6.7)	(17.0)
Foreign	(11.4)	(13.5)	(7.0)
Total deferred	(86.4)	(25.3)	(146.3)
Total income tax expense (benefit)	$ (48.9)	$ (57.1)	$ 2.5