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Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Short-term debt $ 35,509 $ 177,629
Current portion of long-term debt, including capital leases 790,560 613,781
Short-term debt and current portion of long-term debt 826,069 791,410
Total before fair market value adjustment 5,394,787 5,226,756
Fair market value adjustment on notes subject to hedging (3) (7,192)  
Debt issuance costs (13,453) (14,221)
Total after fair market value adjustment 5,374,142 5,213,645
Long-term debt 4,583,582 4,599,864
Total debt $ 5,409,651 $ 5,391,274
Short-term debt    
Short-term Debt [Line Items]    
Short-term debt, Weighted-Average interest rate 1.79% 1.07%
U.S. commercial paper    
Short-term Debt [Line Items]    
Weighted-Average interest rate 1.56% 0.87%
Commercial paper $ 570,218 $ 342,480
Global revolving credit facility    
Short-term Debt [Line Items]    
Weighted-Average interest rate 2.80% 2.06%
Global revolving credit facility $ 17,328 $ 4,703
Unsecured U.S. notes – Medium-term notes    
Short-term Debt [Line Items]    
Weighted-Average interest rate 2.73% 2.67%
Unsecured U.S. notes - Medium-term notes $ 4,014,091 $ 4,113,421
Unsecured U.S. obligations, principally bank term loans    
Short-term Debt [Line Items]    
Weighted-Average interest rate 2.79% 2.19%
Unsecured U.S. obligations, principally bank term loans $ 50,000 $ 50,000
Unsecured foreign obligations    
Short-term Debt [Line Items]    
Weighted-Average interest rate 1.50% 1.55%
Unsecured foreign obligations $ 230,380 $ 232,092
Asset-Backed US Obligations    
Short-term Debt [Line Items]    
Weighted-Average interest rate 1.85% 1.80%
Unsecured foreign obligations $ 491,899 $ 459,876
Capital lease obligations    
Short-term Debt [Line Items]    
Weighted-Average interest rate 3.53% 3.17%
Capital lease obligations $ 20,871 $ 24,184
Interest Rate Swap    
Short-term Debt [Line Items]    
Derivative, fair value $ (7,000) $ 1,110