Long-Term Debt and Finance Leases - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 20, 2021
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 236.4
Long-term debt	726.7	$ 724.2
Other Financing		0.4
Finance lease obligations	$ 20.6	$ 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	$ 747.3	$ 746.9
Debt issuance costs, net	(4.6)	(5.5)
Sub-total	742.7	741.4
Less current portion	(17.7)	(17.9)
Long-term portion	$ 725.0	723.5
Term B Loans
Long-Term Debt and Capital Leases
Effective interest rate (as a percent)	7.58%
Long-term debt	$ 717.7	724.2
Debt issuance costs, net	(3.5)	(4.1)
Net discount	5.0	5.8
Revolving Credit Facility
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 236.4
Effective interest rate (as a percent)	7.07%
Long-term debt	$ 9.0
Debt issuance costs, net	(1.1)	$ (1.4)
Maximum borrowing capacity	250.0		$ 250.0
Revolving Credit Facility | Line of credit
Long-Term Debt and Capital Leases
Amount outstanding	9.0
Revolving Credit Facility | Letters of credit
Long-Term Debt and Capital Leases
Maximum borrowing capacity	20.0
Outstanding letters of credit	$ 4.6