Long-Term Debt and Finance Leases - Summary (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 208.5
Long-term debt	2,301.2	$ 2,275.3
Finance lease liability	22.2	23.1
Total long-term debt and finance lease obligations	2,323.4	2,298.4
Debt issuance costs, net	(7.4)	(8.0)
Sub-total	2,316.0	2,290.4
Less current portion	(31.3)	(30.9)
Long-term portion	$ 2,284.7	2,259.5
Term B Loans
Long-Term Debt and Capital Leases
Effective interest rate (as a percent)	5.28%
Long-term debt	$ 2,215.2	2,220.3
Debt issuance costs, net	(5.6)	(6.0)
Net discount	7.8	8.4
Revolving Credit Facility
Long-Term Debt and Capital Leases
Available borrowing capacity	$ 208.5
Effective interest rate (as a percent)	4.05%
Long-term debt	$ 86.0	55.0
Debt issuance costs, net	(1.8)	$ (2.0)
Maximum borrowing capacity	300.0
Outstanding letters of credit	$ 5.5