Long-Term Debt and Finance Leases - Summary (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Dec. 21, 2021
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 245.6
Long-term debt	719.3	$ 724.2
Other Financing	0.1	0.4
Finance lease obligations	$ 21.5	$ 22.3
Finance Lease, Liability, Statement of Financial Position	Long-term portion, Less current portion	Long-term portion, Less current portion
Total long-term debt, finance lease obligations and other	$ 740.9	$ 746.9
Debt issuance costs, net	(4.8)	(5.5)
Sub-total	736.1	741.4
Less current portion	(18.1)	(17.9)
Long-term portion	$ 718.0	723.5
Term B Loans
Long-Term Debt and Capital Leases
Effective interest rate (as a percent)	6.49%
Long-term debt	$ 719.3	724.2
Debt issuance costs, net	(3.7)	(4.1)
Net discount	5.2	5.8
Revolving Credit Facility
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 245.6
Effective interest rate (as a percent)	3.00%
Debt issuance costs, net	$ (1.1)	$ (1.4)
Maximum borrowing capacity	250.0		$ 250.0
Outstanding letters of credit	$ 4.4