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LONG-TERM DEBT AND LINES OF CREDIT - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
May 15, 2020
Dec. 31, 2019
Sep. 18, 2019
Debt Instrument [Line Items]        
Finance lease liabilities $ 75,989   $ 32,996  
Total long-term debt 9,293,764   9,125,501  
Less current portion 827,357   35,137  
Long-term debt, excluding current portion 8,466,407   9,090,364  
Unsecured term loan facility        
Debt Instrument [Line Items]        
Gross long-term debt 1,985,776   1,981,758  
Unsecured revolving credit facility        
Debt Instrument [Line Items]        
Gross long-term debt 36,000   903,000  
Other borrowings        
Debt Instrument [Line Items]        
Gross long-term debt 65,352   33,597  
3.800% senior notes due April 1, 2021 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 752,199   760,996  
Stated interest rate (as a percent) 3.80%     3.80%
3.750% senior notes due June 1, 2023 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 562,258   567,330  
Stated interest rate (as a percent) 3.75%     3.75%
4.000% senior notes due June 1, 2023 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 565,930   572,522  
Stated interest rate (as a percent) 4.00%     4.00%
2.650% senior notes due February 15, 2025 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 993,110   991,423  
Stated interest rate (as a percent) 2.65%      
4.800% senior notes due April 1, 2026 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 809,324   820,623  
Stated interest rate (as a percent) 4.80%     4.80%
4.450% senior notes due June 1, 2028 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 482,588   486,982  
Stated interest rate (as a percent) 4.45%     4.45%
3.200% senior notes due August 15, 2029 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 1,236,424   1,234,843  
Stated interest rate (as a percent) 3.20%      
2.900% senior notes due May 15, 2030 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 989,025   0  
Stated interest rate (as a percent) 2.90% 2.90%    
4.150% senior notes due August 15, 2049 | Senior notes        
Debt Instrument [Line Items]        
Gross long-term debt $ 739,789   $ 739,431  
Stated interest rate (as a percent) 4.15%