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DEBT (Revolving Credit Facility) (Details) - USD ($)
1 Months Ended
Jun. 19, 2015
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]        
Bank overdraft       $ 25,000,000
Letters of credit issued     $ 5,000,000 5,000,000
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Revolving credit facility, maximum borrowing capacity $ 2,000,000,000      
Line of credit facility, term 5 years      
Line of credit, Current       $ 0
Revolving Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Commitment fee rate 0.085%      
Revolving Credit Facility | Minimum | Rate 2C        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.00%      
Revolving Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Commitment fee rate 0.20%      
Revolving Credit Facility | Maximum | Rate 2C        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.50%      
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Rate 1        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.875%      
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Rate 1        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.50%      
Revolving Credit Facility | Federal Funds Purchased | Rate 2B        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.50%      
Revolving Credit Facility | One Month LIBOR | Rate 2C        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.00%      
Letter of Credit        
Line of Credit Facility [Line Items]        
Revolving credit facility, maximum borrowing capacity $ 70,000,000      
Swingline Loans        
Line of Credit Facility [Line Items]        
Revolving credit facility, maximum borrowing capacity $ 50,000,000      
3.5% Borrowings - January 2019 [Member] | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Short term debt     $ 250,000,000  
Debt Instrument, Interest Rate, Stated Percentage     3.50%  
Subsequent Event | 3.5% Borrowings - April 2019 [Member] | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Proceeds from Issuance of Debt   $ 150,000,000    
Debt Instrument, Interest Rate, Stated Percentage   3.50%