Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	1 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 07, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 0.3	$ 2.9	$ 3.3
Operating cash flows from operating leases	0.8	7.2	9.5
Financing cash flows from finance leases	1.2	9.9	13.9
Right-of-use assets obtained in exchange for lease obligations:
New operating leases	0.0	11.5	6.8
New finance leases	$ 0.0	$ 3.8	$ 4.0