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Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal statutory	$ (128.2)	$ (111.9)	$ (23.9)
Foreign income taxes	(21.5)	(40.2)	(39.7)
Change in enacted tax rate	2.1	0.2	(8.3)
Transition tax	0.0	(7.5)	5.8
State and local	(5.0)	(20.0)	(12.8)
Tax credits	(9.7)	(9.6)	(20.1)
Valuation allowance	19.8	12.6	12.9
Goodwill impairment	107.1	92.4	21.6
Withholding taxes	5.6	4.0	6.6
U.S. tax on unremitted foreign earnings	0.0	(2.8)	4.1
Tax benefit on loss carryback	(14.4)	0.0	0.0
Global intangible low-taxed income	2.3	31.1	8.0
Uncertain tax positions	(8.8)	5.9	(9.8)
Other	1.5	(3.1)	(1.5)
Total income tax benefit	$ (49.2)	$ (48.9)	$ (57.1)

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