Long-Term Debt and Capital Leases - Summary of Long-Term Debt and Capital Leases (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt and Capital Leases
Available borrowing capacity		$ 112.1
Weighted average interest rate (as a percent)	[1]	4.57%
Outstanding balance		$ 2,446.5	$ 2,889.2
Capital lease obligations		3.2	4.9
Total long-term debt and capital lease obligations		2,449.7	2,894.1
Less debt issuance costs	[2]	(13.6)	(22.9)
Sub-total		2,436.1	2,871.2
Less current portion		(24.1)	(22.7)
Long-term portion		$ 2,412.0	2,848.5
Term B Loans
Long-Term Debt and Capital Leases
Weighted average interest rate (as a percent)	[1],[3]	4.55%
Outstanding balance	[3]	$ 2,266.5	2,048.3
Less debt issuance costs		(9.8)
Debt net discount		13.5
Revolving Credit Facility
Long-Term Debt and Capital Leases
Available borrowing capacity	[4]	$ 112.1
Weighted average interest rate (as a percent)	[1],[4]	4.29%
Outstanding balance	[4]	$ 180.0	10.0
Less debt issuance costs		(3.8)
Maximum borrowing capacity		300.0
Outstanding letters of credit		$ 7.9
Senior Notes
Long-Term Debt and Capital Leases
Outstanding balance			$ 830.9

[1] Represents the weighted average effective interest rate in effect for all borrowings outstanding as of September 30, 2017 pursuant to each debt instrument including the applicable margin.

[2] At September 30, 2017, debt issuance costs include $9.8 million related to Term B Loans and $3.8 million related to Revolving Credit Facility.

[3] At September 30, 2017 includes $13.5 million of net discounts.

[4] Available borrowing capacity at September 30, 2017 represents $300.0 million of total availability less outstanding letters of credit of $7.9 million and borrowing on revolving credit facility of $180.0 million. Letters of credit are used in the ordinary course of business and are released when the respective contractual obligations have been fulfilled by the Company.