Income Taxes - Income (Loss) before Provision for Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Feb. 07, 2019		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S.	$ (131.7)		$ (398.1)	$ (811.5)		$ 229.8
Non-U.S	28.9		178.8	135.6		143.3
Income (loss) before provision (benefit) for income taxes and equity in net income of affiliates	$ (102.8)	[1]	$ (219.3)	$ (675.9)	[1]	$ 373.1

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