Long-Term Debt and Finance Leases - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 250.0
Long-term debt	724.2	$ 2,237.9
Other Financing	0.4	0.8
Finance lease obligations	22.3	32.9
Total long-term debt, finance lease obligations and other	746.9	2,271.6
Debt issuance costs, net	(5.5)	(5.6)
Sub-total	741.4	2,266.0
Less current portion	(17.9)	(37.5)
Long-term portion	$ 723.5	2,228.5
Term B Loans
Long-Term Debt and Capital Leases
Effective interest rate (as a percent)	3.50%
Long-term debt	$ 724.2	2,199.9
Debt issuance costs, net	(4.1)	(4.4)
Net discount	5.8	6.1
Revolving Credit Facility
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 250.0
Effective interest rate (as a percent)	0.00%
Long-term debt		38.0
Debt issuance costs, net	$ (1.4)	$ (1.2)