Leases - Schedule of Other Information Related to Leases (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
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 1.2	$ 2.9	$ 4.4	$ 5.1
Operating cash flows from operating leases	3.4	7.2	12.1	11.0
Financing cash flows from finance leases	3.9	9.9	16.6	14.4
Right-of-use assets obtained in exchange for lease obligations:
New operating leases	5.4	11.5	12.6	7.5
New finance leases	$ 2.0	$ 3.8	$ 7.7	$ 14.5