Income Taxes - Schedule of Income Tax (Benefit) Provision Charged to Continuing Operations or Accumulated Other Comprehensive Income (Loss) (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
Income tax (benefit) provision related to:
Continuing operations	$ (7.3)	$ (16.9)	$ (25.5)	$ (10.6)
Accumulated other comprehensive income (loss)	$ 0.8	$ 10.8	$ 2.4	$ 0.2