Debt - Long-Term Debt Instruments (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Apr. 02, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Capital lease obligations	$ 1,800,000	$ 3,100,000
Long-term debt and capital lease obligations	1,878,400,000	1,968,700,000
Long-term Debt and Capital Lease Obligations, Current	25,800,000	26,600,000
Long-term debt and capital lease obligations, noncurrent portion	1,852,600,000	1,942,100,000
Less: unamortized deferred debt issuance costs	13,700,000	16,600,000
Total	1,838,900,000	1,925,500,000
Senior Notes | Senior Notes with interest payable semi-annually at 4.95%, payable in 2022
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 250,000,000	$ 250,000,000
Stated interest rate	4.95%	4.95%	4.875%
Principal amount			$ 250,000,000
Senior Notes | Senior Notes with interest payable semi-annually at 4.8%, payable in 2021
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 425,000,000	$ 425,000,000
Stated interest rate	4.80%	4.80%		4.75%
Principal amount				$ 425,000,000
Term Loans
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 975,000,000	$ 1,000,000,000
Principal amount					$ 1,000,000,000
Interest rate at period end	1.70%
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 224,800,000	288,400,000
Interest rate at period end	1.90%
Other Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,800,000	$ 2,200,000