Income Taxes - Schedule of Income Tax Expense (Benefit) for Continuing Operations (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0.0	$ 0.0	$ (1.4)	$ (1.4)
State and local	(0.4)	0.7	0.6	0.0
Foreign	1.6	3.1	3.5	0.5
Total current	1.2	3.8	2.7	(0.9)
Deferred:
Federal	(9.2)	(16.1)	(13.8)	(9.1)
State and local	7.4	(3.8)	7.7	(1.5)
Foreign	(0.7)	(0.8)	(1.3)	0.4
Total deferred	(2.5)	(20.7)	(7.4)	(10.2)
Valuation allowance	(6.0)		(20.8)	0.5
Total	$ (7.3)	$ (16.9)	$ (25.5)	$ (10.6)