Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory	$ (111.9)	$ (23.9)	$ 119.0
Foreign income taxes	(40.2)	(39.7)	(96.3)
Change in enacted tax rate	0.2	(8.3)	(107.6)
Transition tax	(7.5)	5.8	108.3
State and local	(20.0)	(12.8)	(6.3)
Tax credits	(9.6)	(20.1)	(8.8)
Valuation allowance	12.6	12.9	(6.1)
Goodwill impairment	92.4	21.6	0.0
Withholding taxes	4.0	6.6	4.7
U.S. tax on unremitted foreign earnings	(2.8)	4.1	(18.6)
Global intangible low-taxed income	31.1	8.0	0.0
Uncertain tax positions	5.9	(9.8)	13.5
Other	(3.1)	(1.5)	0.7
Total income tax expense (benefit)	$ (48.9)	$ (57.1)	$ 2.5