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Debt - LT Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Long-term debt $ 2,640,129 $ 3,239,115  
Proceeds from note offering, net 0 0 $ 986,203
Accounts receivable, net 8,482,687 8,945,463  
Loss on extinguishment of debt 0 0 59,545
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 331,431    
Long-term Debt, Maturities, Repayments of Principal in Year Two 536,881    
Long-term Debt, Maturities, Repayments of Principal in Year Three 349,115    
Long-term Debt, Maturities, Repayments of Principal in Year Four 308,207    
Long-term Debt, Maturities, Repayments of Principal in Year Five 495,053    
Long-term Debt, Maturities, Repayments of Principal after Year Five 950,873    
Investment Income, Interest and Dividend 54,815 47,860 31,156
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 209,512 213,913 156,974
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity 2,000,000    
Long-term debt $ 10,000 0  
Debt Instrument, Interest Rate, Effective Percentage 2.72%    
Facility Fee 0.20%    
Debt Instrument, Basis Spread on Variable Rate 1.18%    
North American Asset Securitization Program [Member]      
Debt Instrument [Line Items]      
Maximum Borrowing Capacity $ 1,200,000    
Long-term debt $ 400,000 810,000  
Debt Instrument, Interest Rate, Effective Percentage 2.18%    
Facility Fee 0.40%    
Debt Instrument, Basis Spread on Variable Rate 0.40%    
Accounts receivable, net $ 2,217,800 2,754,400  
6.00% Notes, Due 2020 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 0 209,147  
Debt Instrument, Interest Rate, Stated Percentage 6.00%    
5.125% Notes, Due 2021 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 130,691 130,546  
Debt Instrument, Fair Value $ 134,500 134,500  
Debt Instrument, Interest Rate, Stated Percentage 5.125%    
3.50% Notes, Due 2022 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 348,088 347,288  
Debt Instrument, Fair Value $ 358,500 345,000  
Debt Instrument, Interest Rate, Stated Percentage 3.50%    
4.50% Notes, Due 2023 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 298,148 297,622  
Debt Instrument, Fair Value $ 316,000 303,500  
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
3.25% Notes, Due 2024 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 495,045 494,091  
Debt Instrument, Fair Value 515,500 467,000  
Debt Instrument, Face Amount $ 500,000    
Debt Instrument, Interest Rate, Stated Percentage 3.25%    
Proceeds from note offering, net     493,810
4.00% Notes, Due 2025 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 346,368 345,762  
Debt Instrument, Fair Value $ 367,000 340,500  
Debt Instrument, Interest Rate, Stated Percentage 4.00%    
7.50% Senior Debentures, Due 2027 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 109,857 109,776  
Debt Instrument, Fair Value $ 135,000 128,000  
Debt Instrument, Interest Rate, Stated Percentage 7.50%    
3.875% Notes, Due 2028 [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 494,648 494,095  
Debt Instrument, Fair Value 516,500 458,500  
Debt Instrument, Face Amount $ 500,000    
Debt Instrument, Interest Rate, Stated Percentage 3.875%    
Proceeds from note offering, net     494,625
Loss on extinguishment of debt     $ 59,545
Other obligations with various interest rates and due dates [Member]      
Debt Instrument [Line Items]      
Other Notes Payable, Noncurrent $ 7,284 $ 788  
Notes Due in 2018 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 300,000    
Debt Instrument, Interest Rate, Stated Percentage 3.00%    
Senior Debentures Due in 2018 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.875%