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Financial Instruments - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Feb. 10, 2021
Senior Notes | 4¾% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate 4.75%  
Senior Notes | 3¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate 3.25%  
Senior Notes | 4⅛% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate 4.125%  
Senior Notes | 2¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate 2.25%  
Senior Notes | 1.4% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior note interest rate 1.40% 1.40%
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 270,567  
Carrying Amount | Bank debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 1,346,003  
Carrying Amount | Senior Notes | 4¾% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 300,000  
Carrying Amount | Senior Notes | 3¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 753,285  
Carrying Amount | Senior Notes | 4⅛% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 599,172  
Carrying Amount | Senior Notes | 2¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 579,450  
Carrying Amount | Senior Notes | 1.4% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 499,758  
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 270,567  
Fair Value | Bank debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 1,346,003  
Fair Value | Senior Notes | 4¾% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 304,140  
Fair Value | Senior Notes | 3¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 760,291  
Fair Value | Senior Notes | 4⅛% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 616,500  
Fair Value | Senior Notes | 2¼% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt 584,607  
Fair Value | Senior Notes | 1.4% Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Bank debt $ 492,000