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Debt (Narrative) (Details)
3 Months Ended 6 Months Ended
Feb. 26, 2021
USD ($)
Feb. 18, 2021
USD ($)
Feb. 05, 2021
USD ($)
quarter
Jan. 16, 2021
USD ($)
Jan. 30, 2020
USD ($)
Jan. 21, 2020
USD ($)
Nov. 26, 2019
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Feb. 25, 2020
USD ($)
Nov. 15, 2017
USD ($)
Debt Instrument [Line Items]                            
Amount expended on share repurchases in open market transactions                     $ 199,903,000      
Proceeds from senior notes, net of issuance costs                   $ 741,393,000 $ 738,107,000      
Unsecured Debt [Member]                            
Debt Instrument [Line Items]                            
Redemption price as percent of aggregate principle amount (percent)                   101.00%        
Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity             $ 250,000,000.0              
Debt instrument, term             5 years              
Additional borrowing capacity             $ 250,000,000.0              
Amount outstanding                   $ 0   $ 0    
ASR Counterparty [Member]                            
Debt Instrument [Line Items]                            
Amount expended on share repurchases in open market transactions         $ 1,000,000,000.00                  
2026 Notes [Member] | Unsecured Debt [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, face amount   $ 750,000,000.0               750,000,000.0        
Stated interest rate percentage   1.25%                        
Proceeds from senior notes, net of issuance costs   $ 741,400,000                        
2030 Notes [Member] | Unsecured Debt [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                   750,000,000.0     $ 750,000,000.0  
Stated interest rate percentage                         3.30%  
2027 Notes [Member] | Unsecured Debt [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                   $ 750,000,000.0       $ 750,000,000.0
Stated interest rate percentage                           4.50%
Minimum [Member] | Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Quarterly facility fee (percent)                   0.11%        
Maximum [Member] | Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Quarterly facility fee (percent)                   0.20%        
2021 Term Loan Credit Agreement [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity $ 1,000,000,000.00   $ 1,000,000,000.00                      
Proceeds from term loan credit agreement $ 1,000,000,000.00                          
Consolidated leverage ratio (not more than)     4.0                      
Mandatory step-down consolidated leverage ratio     3.75                      
Qualified Acquisition step-down consolidated leverage ratio     4.25                      
Number of fiscal quarters following a qualified acquisition | quarter     4                      
Consolidated interest coverage ratio     3.0                      
2020 Credit Agreement [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity           $ 1,000,000,000.00                
Proceeds from term loan credit agreement         $ 1,000,000,000.00                  
Repayment of term loan credit agreement                 $ 750,000,000.0          
2020 Credit Agreement [Member] | 364-day Term Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity           $ 500,000,000.0                
Debt instrument, term           364 days                
2020 Credit Agreement [Member] | 3-year Term Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity           $ 500,000,000.0                
Debt instrument, term           3 years                
Amended Term Loan Credit Agreement [Member]                            
Debt Instrument [Line Items]                            
Consolidated leverage ratio (not more than)     4.0                      
Mandatory step-down consolidated leverage ratio     3.75                      
Qualified Acquisition step-down consolidated leverage ratio     4.25                      
Number of fiscal quarters following a qualified acquisition | quarter     4                      
Letter of Credit [Member] | Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity             25,000,000.0              
Swing Line Loans [Member] | Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity             $ 10,000,000.0              
Amended Credit Agreement [Member]                            
Debt Instrument [Line Items]                            
Consolidated leverage ratio (not more than)     4.0                      
Mandatory step-down consolidated leverage ratio     3.75                      
Qualified Acquisition step-down consolidated leverage ratio     4.25                      
Number of fiscal quarters following a qualified acquisition | quarter     4                      
Credit Agreement [Member] | 364-day Term Loan Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity       $ 1,450,000,000                    
Debt instrument, term       364 days                    
Debt issuance costs expensed               $ 5,400,000