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Borrowings (Details)
€ in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Long-term borrowings [Abstract]      
Net long-term debt $ 3,063,374   $ 3,108,829
Unamortized debt discounts 16,800   17,600
Deferred debt issuance costs 13,900   14,400
Line of Credit Facility [Abstract]      
Unsecured revolving credit facility, maximum borrowing capacity 1,000,000    
Letters of Credit Outstanding, Amount 145,700    
Current poriton of long-term debt and short-term borrowings $ 500,000    
Note due 2025 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 3.15% 3.15%  
Debt Instrument, Term 10 years    
Debt Instrument, Maturity Date Nov. 15, 2025    
Long-term debt $ 396,884   396,716
Debt Instrument, Face Amount $ 400,000    
Note due 2026 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 1.25% 1.25%  
Debt Instrument, Term 10 years    
Debt Instrument, Maturity Date Nov. 09, 2026    
Long-term debt $ 699,283   724,310
Debt Instrument, Face Amount | €   € 600,000  
Note due 2027 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 0.75% 0.75%  
Debt Instrument, Term 8 years    
Debt Instrument, Maturity Date Nov. 04, 2027    
Long-term debt $ 582,232   603,107
Debt Instrument, Face Amount | €   € 500,000  
Debentures due 2028 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 6.65% 6.65%  
Debt Instrument, Term 30 years    
Debt Instrument, Maturity Date Jun. 01, 2028    
Long-term debt $ 199,280   199,255
Debt Instrument, Face Amount $ 200,000    
Note due 2029      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 2.95% 2.95%  
Debt Instrument, Term 10 years    
Debt Instrument, Maturity Date Nov. 04, 2029    
Long-term debt $ 296,744   296,650
Debt Instrument, Face Amount $ 300,000    
Debenture due 2035 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 5.375% 5.375%  
Debt Instrument, Term 30 years    
Debt Instrument, Maturity Date Oct. 15, 2035    
Long-term debt $ 296,372   296,309
Debt Instrument, Face Amount $ 300,000    
Note due 2038 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 6.60% 6.60%  
Debt Instrument, Term 30 years    
Debt Instrument, Maturity Date Mar. 15, 2038    
Long-term debt $ 248,081   248,053
Debt Instrument, Face Amount $ 250,000    
Note due 2041 [Member]      
Long-term borrowings [Abstract]      
Debt Instrument, Interest Rate, Stated Percentage 5.375% 5.375%  
Debt Instrument, Term 30 years    
Debt Instrument, Maturity Date Mar. 01, 2041    
Long-term debt $ 344,498   $ 344,429
Debt Instrument, Face Amount $ 350,000