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Long-term Debt and Capitalized Lease Obligations - Narrative (Details) - USD ($)
Jun. 16, 2018
Feb. 24, 2018
Feb. 18, 2018
Debt Instrument [Line Items]      
Debt covenant - maximum cumulative distributions limit as a percentage of total assets 4.00%    
Book value of debt $ 11,000,400,000 $ 11,011,200,000  
Outstanding balance on letters of credit 208,800,000 205,600,000  
Capitalized lease obligations 841,300,000 864,600,000  
Current maturities of capitalized lease obligations 103,600,000 102,100,000  
Long-term maturities of capitalized lease obligations 737,700,000 762,500,000  
LOC Sub-facility      
Debt Instrument [Line Items]      
Outstanding balance on letters of credit 572,500,000 576,800,000  
Line of credit | Asset-Based Loan Facility      
Debt Instrument [Line Items]      
Outstanding balance on line of credit 0 $ 0  
Maximum      
Debt Instrument [Line Items]      
Debt covenant - maximum cumulative distributions limit $ 1,000,000,000    
Revolving Credit Facility | Maximum | Line of credit      
Debt Instrument [Line Items]      
Excess availability amount, cash on hand     $ 500,000,000
Revolving Credit Facility | Minimum | Line of credit      
Debt Instrument [Line Items]      
Excess availability amount     $ 2,000,000,000