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Borrowings (Details)
€ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Maturities of Long-term Debt [Abstract]          
Next 12 Months $ 0        
+2 Years 0        
+3 Years 0        
+4 Years 0        
+5 Years 396,716        
Thereafter 2,712,113        
Total future maturities 3,108,829        
Short-term borrowings [Abstract]          
Commercial paper 0 $ 84,700      
Total short-term debt 0 84,700      
Long-term borrowings [Abstract]          
Long-term Debt 3,108,829 2,985,716      
Unamortized discount 17,600 18,900      
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net 14,400 16,200      
Line of Credit Facility [Abstract]          
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000        
Line of credit facility, interest rate description At the Company's election, loans under the Credit Agreement will bear interest at a base rate plus an applicable margin.        
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, a requirement to maintain a minimum 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 all covenants in the Credit Agreement and other long-term debt covenants at December 31, 2020 and had an interest coverage ratio of consolidated EBITDA to consolidated net interest expense of 11.4 to 1.        
Line of Credit Facility, Current Borrowing Capacity $ 450,000        
Gain (Loss) on Extinguishment of Debt 0 23,543 $ 0    
Letters of Credit [Abstract]          
Letters of credit outstanding $ 152,500        
Note due 2025 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 3.15%     3.15%  
Debt Instrument, Term 10 years        
Debt instruments, maturity date Nov. 15, 2025        
Face amount of notes $ 400,000        
Long-term Debt $ 396,716 396,042      
Note due 2026 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 1.25%     1.25%  
Debt Instrument, Term 10 years        
Debt instruments, maturity date Nov. 09, 2026        
Face amount of notes | €       € 600,000  
Long-term Debt $ 724,310 658,089      
Note due 2027 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 0.75%     0.75%  
Debt Instrument, Term 8 years        
Debt instruments, maturity date Nov. 04, 2027        
Face amount of notes | €       € 500,000  
Long-term Debt $ 603,107 548,008      
Debentures due 2028 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 6.65%     6.65%  
Debt Instrument, Term 30 years        
Debt instruments, maturity date Jun. 01, 2028        
Face amount of notes $ 200,000        
Long-term Debt $ 199,255 199,155      
Debentures due 2029 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 2.95%     2.95%  
Debt Instrument, Term 10 years        
Debt instruments, maturity date Nov. 04, 2029        
Face amount of notes   300,000      
Long-term Debt $ 296,650 296,270      
Debenture due 2035 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 5.375%     5.375%  
Debt Instrument, Term 30 years        
Debt instruments, maturity date Oct. 15, 2035        
Face amount of notes $ 300,000        
Long-term Debt $ 296,309 296,060      
Note due 2038 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 6.60%     6.60%  
Debt Instrument, Term 30 years        
Debt instruments, maturity date Mar. 15, 2038        
Face amount of notes $ 250,000        
Long-term Debt $ 248,053 247,939      
Note due 2041 [Member]          
Long-term borrowings [Abstract]          
Debt instrument, stated interest rate (in hundredths) 5.375%     5.375%  
Debt Instrument, Term 30 years        
Debt instruments, maturity date Mar. 01, 2041        
Face amount of notes $ 350,000        
Long-term Debt $ 344,429 344,153      
Note due 2020 [Member]          
Long-term borrowings [Abstract]          
Face amount of notes | €         € 300,000
Note due 2021 [Member]          
Long-term borrowings [Abstract]          
Face amount of notes   $ 450,000