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Master Lease Financing Obligation (Details) - Master Lease Agreement - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Capital Leased Assets        
Discount rate (as a percent)     9.70%  
Total payments under Master Lease $ 109.7 $ 109.0 $ 331.9 $ 327.3
Interest expense for the Master Lease $ 97.4 $ 97.8 $ 293.9 $ 291.9