Debt and Other Financing Arrangements - Debt Maturity Schedule (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
2022		$ 12.0
2023		34.3
2024		165.6
2025		12.0
2026		32.3
Thereafter		1,180.4
Long-Term Debt, Excluding Finance Leases, Gross		1,436.6
Net unamortized (discount) premium	[1]	(4.9)	$ 1.1
Unamortized note issuance costs	[2]	(44.8)	$ (18.9)
Total debt		1,386.9
2022		0.5
2023		0.4
2024		0.0
2025		0.0
2026		0.0
Thereafter		0.0
Other Financing Arrangements, Gross		0.9
Other Financing Arrangement, Net unamortized discount		0.0
Other Financing Arrangements, Unamortized note issuance costs		0.0
Other Financing Arrangements, Net		$ 0.9

[1] Net unamortized premium was determined to not meet the definition of an asset under ASC 805 as of the Merger Date and was therefore not recognized by the Company in the Successor period. As of December 31, 2021, net unamortized discount is associated with the Term B-1 Loans and Term B-2 Loans (defined below).

[2] Unamortized note issuance costs of $9.3 million were determined to not meet the definition of an asset under ASC 805 as of the Merger Date and were therefore not recognized by the Company in the Successor period. As of December 31, 2021, unamortized note issuance costs are associated with the Term B-1 Loans and Term B-2 Loans.