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Debt (Narrative) (Details)
3 Months Ended 9 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 ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
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                
Debt instrument, term             5 years                
Additional borrowing capacity             $ 250,000,000                
Amount outstanding               $ 0     $ 0   $ 0    
ASR Counterparty [Member]                              
Debt Instrument [Line Items]                              
Amount expended on share repurchases in open market transactions         $ 1,000,000,000                    
2026 Notes [Member] | Unsecured Debt [Member]                              
Debt Instrument [Line Items]                              
Debt instrument, face amount   $ 750,000,000           750,000,000     750,000,000        
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     750,000,000     $ 750,000,000  
Stated interest rate percentage                           3.30%  
2027 Notes [Member] | Unsecured Debt [Member]                              
Debt Instrument [Line Items]                              
Debt instrument, face amount               750,000,000     $ 750,000,000       $ 750,000,000
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   $ 1,000,000,000                        
Proceeds from term loan credit agreement $ 1,000,000,000                            
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                  
Proceeds from term loan credit agreement         $ 1,000,000,000                    
Repayment of term loan credit agreement               $ 150,000,000   $ 750,000,000          
2020 Credit Agreement [Member] | 364-day Term Loan Facility [Member]                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity           $ 500,000,000                  
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                  
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                
Swing Line Loans [Member] | Line of Credit [Member]                              
Debt Instrument [Line Items]                              
Credit facility, maximum borrowing capacity             $ 10,000,000                
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