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Debt - Fair Value and Carrying Value of Debt Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Jun. 09, 2015
Jan. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Less current portion of long-term debt and commercial paper $ 1,331,917 $ 1,203,683    
3.85% Senior Notes due February 1, 2023        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate percentage 3.85%     3.85%
2.00% Senior Notes due January 14, 2022        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate percentage 2.00%   2.00%  
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital leases and other $ 6,832 6,934    
Unamortized debt issuance costs (5,846) (6,260)    
Total debt 2,963,528 2,821,176    
Less current portion of long-term debt and commercial paper 1,331,917 1,203,683    
Long-term debt, less current portion 1,631,611 1,617,493    
Fair Value | 3.85% Senior Notes due February 1, 2023        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 611,394 622,752    
Fair Value | 2.00% Senior Notes due January 14, 2022        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 650,302 634,193    
Fair Value | Floating Rate Notes due September 11, 2019        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 370,093 360,807    
Fair Value | 2015 Senior Credit Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 52,432 62,104    
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital leases and other 6,832 6,934    
Unamortized debt issuance costs (5,846) (6,260)    
Total debt 2,917,568 2,763,578    
Less current portion of long-term debt and commercial paper 1,331,917 1,203,683    
Long-term debt, less current portion 1,585,651 1,559,895    
Carrying Value | 3.85% Senior Notes due February 1, 2023        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 600,000 600,000    
Carrying Value | 2.00% Senior Notes due January 14, 2022        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 616,143 600,096    
Carrying Value | Floating Rate Notes due September 11, 2019        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 369,686 360,058    
Carrying Value | 2015 Senior Credit Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable 52,432 62,104    
United States | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Commercial paper 342,400 228,500    
United States | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Commercial paper 342,400 228,500    
Europe | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Commercial paper 935,921 912,146    
Europe | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Commercial paper $ 935,921 $ 912,146