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Borrowings (Details)
$ in Thousands, € in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
EUR (€)
Letters of Credit [Abstract]        
Letters of credit outstanding $ 116,210      
Maturities of Long-term Debt [Abstract]        
2015 122      
2016 122      
2017 349,290      
2018 0      
2019 328,592      
2020 and thereafter 1,939,338      
Interest expense and interest income [Abstract]        
Interest expense 131,676 $ 131,689 $ 124,535  
Interest income (4,419) (4,510) (3,881)  
Interest expense, net $ 127,257 127,179 120,654  
Debt Instrument [Line Items]        
Document Period End Date Dec. 31, 2015      
Short-term borrowings [Abstract]        
Current installments $ 122 299,956    
Commercial paper 151,000 478,000    
Total short-term debt 151,122 777,956    
Long-term borrowings [Abstract]        
Long-term debt 2,617,464 2,552,997    
Unamortized discount 13,951 12,011    
Proceeds from long-term debt, net of discount and issuance costs $ 394,300 0 $ 403,776  
Document Fiscal Year Focus 2015      
Total long-term debt $ 2,617,342 2,253,041    
Line of Credit Facility [Abstract]        
Line of credit facility, interest rate description At the Company's election, loans under the Credit Agreement will bear interest at a Canadian Dollar, Eurodollar, Swedish Kronor, or Sterling rate based on CDOR, EURIBOR, LIBOR or STIBOR, plus an applicable margin ranging from 0.580% to 1.000% (subject to adjustment based on the credit rating accorded the Company's senior unsecured debt by S&P and Moody's), or at a base rate pursuant to a formula defined in the Credit Agreement.      
Line of credit facility, covenant terms the Credit Agreement requires the Company to pay a facility fee and imposes various restrictions on the Company such as, among other things, the requirement for the Company to maintain an interest coverage ratio of EBITDA to consolidated net interest expense of not less than 3.0 to 1      
Line of credit facility, covenant compliance The Company was in compliance with this covenant and its other long-term debt covenants at December 31, 2015 and had a coverage ratio of 13.3 to 1.      
Note due 2015 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 0 299,836    
Debt instrument, stated interest rate (in hundredths) 4.875%     4.875%
Term of debt instrument (in years) 10 years      
Debt instruments, maturity date Oct. 15, 2015      
Face amount of notes $ 300,000      
Note due 2018 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 349,258 348,928    
Debt instrument, stated interest rate (in hundredths) 5.45%     5.45%
Term of debt instrument (in years) 10 years      
Debt instruments, maturity date Mar. 15, 2018      
Note due 2020 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 328,592 363,970    
Debt instrument, stated interest rate (in hundredths) 2.125%     2.125%
Term of debt instrument (in years) 7 years      
Debt instruments, maturity date Dec. 01, 2020      
Note due 2021 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 449,865 449,839    
Debt instrument, stated interest rate (in hundredths) 4.30%     4.30%
Term of debt instrument (in years) 10 years      
Debt instruments, maturity date Mar. 01, 2021      
Note due 2025 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 396,951 0    
Debt instrument, stated interest rate (in hundredths) 3.15%     3.15%
Term of debt instrument (in years) 10 years      
Debt instruments, maturity date Nov. 15, 2025      
Face amount of notes | €       € 400.0
Debentures due 2028 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 199,552 199,517    
Debt instrument, stated interest rate (in hundredths) 6.65%     6.65%
Term of debt instrument (in years) 30 years      
Debt instruments, maturity date Jun. 01, 2028      
Note due 2038 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 248,036 247,948    
Debt instrument, stated interest rate (in hundredths) 6.60%     6.60%
Term of debt instrument (in years) 30 years      
Debt instruments, maturity date Mar. 15, 2038      
Note due 2041 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 345,989 345,830    
Debt instrument, stated interest rate (in hundredths) 5.375%     5.375%
Term of debt instrument (in years) 30 years      
Debt instruments, maturity date Mar. 01, 2041      
Debenture due 2035 [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 296,844 296,685    
Debt instrument, stated interest rate (in hundredths) 5.375%     5.375%
Term of debt instrument (in years) 30 years      
Debt instruments, maturity date Oct. 15, 2035      
Other long term debt instruments [Member]        
Long-term borrowings [Abstract]        
Long-term debt $ 2,377 $ 444    
Commercial Paper [Member]        
Short-term borrowings [Abstract]        
Short-term Debt, Weighted Average Interest Rate 0.20% 0.10% 0.10% 0.20%
Credit Agreement [Member]        
Line of Credit Facility [Abstract]        
Unsecured revolving credit facility, maximum borrowing capacity $ 1,000,000      
Credit facility expiration date Nov. 10, 2020      
Minimum [Member]        
Line of Credit Facility [Abstract]        
Credit facility expiration date Dec. 31, 2016      
Maximum [Member]        
Line of Credit Facility [Abstract]        
Credit facility expiration date Dec. 31, 2020