Income Taxes - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Feb. 07, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Effective tax rate (as a percent)		26.70%	13.60%	26.70%	50.20%	18.00%
Income tax benefit	[1]	$ 27.5	$ 27.5	$ 23.1	$ 101.8	$ 60.1
Income (loss) before provision (benefit) for income taxes and equity in net income of affiliates	[1]	$ (102.8)	$ (201.9)	$ (86.4)	(202.9)	$ (333.1)
Net benefit from CARES Act					$ 53.7

[1] See Note 1 "Basis of Presentation" for further discussion.