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Debt - Fair Value and Carrying Value of Debt Instruments (Details) - USD ($)
Dec. 19, 2012
Sep. 30, 2017
Dec. 31, 2016
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   $ 1,172,781,000 $ 1,382,738,000    
Secured Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Debt instrument term 3 years        
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   $ 10,579,000 11,643,000    
Unamortized debt issuance costs   (6,607,000) (7,117,000)    
Total debt   2,779,585,000 2,556,967,000    
Less current portion of long term debt and commercial paper   1,172,781,000 1,382,738,000    
Long-term debt, less current portion   1,606,804,000 1,174,229,000    
Fair Value | Secured Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securitization facility, due December 19, 2017   0 500,000,000    
Fair Value | 3.85% Senior Notes due February 1, 2023          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   625,116,000 615,006,000    
Fair Value | 2.00% Senior Notes due January 14, 2022          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   626,828,000 556,460,000    
Fair Value | Floating Rate Notes due September 11, 2019          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   355,262,000 0    
Fair Value | 2015 Senior Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   18,055,000 60,672,000    
Carrying Value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Capital leases and other   10,579,000 11,643,000    
Unamortized debt issuance costs   (6,607,000) (7,117,000)    
Total debt   2,717,446,000 2,511,485,000    
Less current portion of long term debt and commercial paper   1,172,781,000 1,382,738,000    
Long-term debt, less current portion   1,544,665,000 1,128,747,000    
Carrying Value | Secured Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securitization facility, due December 19, 2017   0 500,000,000    
Carrying Value | 3.85% Senior Notes due February 1, 2023          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   600,000,000 600,000,000    
Carrying Value | 2.00% Senior Notes due January 14, 2022          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   590,667,000 525,984,000    
Carrying Value | Floating Rate Notes due September 11, 2019          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   354,400,000 0    
Carrying Value | 2015 Senior Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Notes payable   18,055,000 60,672,000    
United States | Fair Value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
U.S. commercial paper   122,000,000 283,800,000    
United States | Carrying Value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
U.S. commercial paper   122,000,000 283,800,000    
Europe | Fair Value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
U.S. commercial paper   1,028,352,000 536,503,000    
Europe | Carrying Value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
U.S. commercial paper   $ 1,028,352,000 $ 536,503,000