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Long-Term Debt - Narrative (Details)
Jun. 21, 2018
USD ($)
Feb. 15, 2018
USD ($)
Jun. 30, 2018
USD ($)
Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, unused borrowing capacity, amount     $ 1,300,000,000
Covenant through June 30, 2019 | Amended and Restated Competitive Advance and Revolving Credit Agreement      
Debt Instrument [Line Items]      
Covenant requirement, maximum total leverage ratio 5.0    
Covenant from September 30, 2019 to June 30, 2020 | Amended and Restated Competitive Advance and Revolving Credit Agreement      
Debt Instrument [Line Items]      
Covenant requirement, maximum total leverage ratio 4.75    
Covenant from September 30, 2020 and thereafter | Amended and Restated Competitive Advance and Revolving Credit Agreement      
Debt Instrument [Line Items]      
Covenant requirement, maximum total leverage ratio 4.50    
KFMB      
Debt Instrument [Line Items]      
Proceeds from borrowings on revolving credit facility   $ 220,000,000  
Line of Credit [Member] | Amended and Restated Competitive Advance and Revolving Credit Agreement      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 1,510,000,000.00