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Borrowings (Details)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
Note due 2011 [Member]
USD ($)
Dec. 31, 2013
Note due 2015 [Member]
USD ($)
Dec. 31, 2012
Note due 2015 [Member]
USD ($)
Dec. 31, 2013
Note due 2018 [Member]
USD ($)
Dec. 31, 2012
Note due 2018 [Member]
USD ($)
Dec. 31, 2013
Note due 2020 [Member]
USD ($)
Dec. 31, 2013
Note due 2020 [Member]
EUR (€)
Dec. 31, 2012
Note due 2020 [Member]
USD ($)
Dec. 31, 2013
Note due 2021 [Member]
USD ($)
Dec. 31, 2012
Note due 2021 [Member]
USD ($)
Dec. 31, 2013
Note due 2038 [Member]
USD ($)
Dec. 31, 2012
Note due 2038 [Member]
USD ($)
Dec. 31, 2013
Note due 2041 [Member]
USD ($)
Dec. 31, 2012
Note due 2041 [Member]
USD ($)
Dec. 31, 2013
Debentures due 2028 [Member]
USD ($)
Dec. 31, 2012
Debentures due 2028 [Member]
USD ($)
Dec. 31, 2013
Debenture due 2035 [Member]
USD ($)
Dec. 31, 2012
Debenture due 2035 [Member]
USD ($)
Dec. 31, 2013
Other long term debt instruments [Member]
USD ($)
Dec. 31, 2012
Other long term debt instruments [Member]
USD ($)
Dec. 31, 2013
Commercial Paper [Member]
Dec. 31, 2012
Commercial Paper [Member]
Dec. 31, 2013
Credit Agreement [Member]
USD ($)
Dec. 31, 2013
Debentures [Member]
USD ($)
Dec. 31, 2012
Debentures [Member]
USD ($)
Dec. 31, 2013
Long-term Notes [Member]
USD ($)
Dec. 31, 2012
Long-term Notes [Member]
USD ($)
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Interest expense and interest income [Abstract]                                                                
Interest expense $ 124,647,000 $ 125,995,000 $ 124,783,000                                                          
Interest income (3,905,000) (4,854,000) (9,258,000)                                                          
Interest expense, net 120,742,000 121,141,000 115,525,000                                                          
Letters of Credit [Abstract]                                                                
Letters of credit outstanding 137,671,000                                                              
Maturities of Long-term Debt [Abstract]                                                                
2014 2,778,000                                                              
2015 299,638,000                                                              
2016 0                                                              
2017 0                                                              
2018 348,598,000                                                              
2019 and thereafter 1,950,965,000                                                              
Short-term borrowings [Abstract]                                                                
Current installments (2,778,000) (3,266,000)                                                            
Commercial Paper 226,500,000 607,500,000                                                            
Total short-term debt 229,278,000 610,766,000                                                            
Short-term Debt, Weighted Average Interest Rate                                               0.10% 0.20%              
Long-term borrowings [Abstract]                                                                
Long-term debt 2,601,979,000 2,192,616,000     299,638,000 299,441,000 348,598,000 348,268,000 411,500,000   0 449,813,000 449,787,000 247,859,000 247,771,000 345,671,000 345,511,000 199,483,000 199,448,000 296,526,000 296,367,000 2,891,000 6,023,000                  
Debt instrument, stated interest rate (in hundredths)         4.875%   5.45%   2.125% 2.125%   4.30%   6.60%   5.375%   6.65%   5.375%                        
Term of debt instrument (in years)         10 years   10 years   7 years 7 years   10 years   30 years   30 years   30 years   30 years                        
Debt instruments, maturity date         Oct. 15, 2015   Mar. 15, 2018   Dec. 01, 2020 Dec. 01, 2020   Mar. 01, 2021   Mar. 15, 2038   Mar. 01, 2041   Jun. 01, 2028   Oct. 15, 2035                        
Face amount of notes       400,000,000           300,000,000     450,000,000       350,000,000                              
Unamortized discount                                                     3,991,000 4,185,000 9,196,000 9,222,000    
Proceeds from long-term debt, net of discount and issuance costs 403,776,000 0 788,971,000                                                          
Total long-term debt 2,599,201,000 2,189,350,000                                                            
Line of Credit Facility [Abstract]                                                                
Unsecured revolving credit facility, maximum borrowing capacity                                                   $ 1,000,000,000            
Credit facility expiration date                                                   Nov. 10, 2016         Dec. 31, 2014 Dec. 31, 2018
Line of credit facility, interest rate description At the Company's election, loans under the Credit Agreement will bear interest at a Eurodollar or Sterling rate based on LIBOR, plus an applicable margin ranging from 0.565% to 1.225% (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, 2013 and had a coverage ratio of 13.2 to 1.