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Borrowing Arrangements - Narrative (Details)
1 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jan. 31, 2020
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Jan. 31, 2022
USD ($)
Revolving credit facility | The Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 1,500,000,000          
Line of credit facility, increase limit   2,000,000,000          
Extinguishment of Debt, Amount   $ 650,000,000          
Debt covenant, interest coverage ratio, minimum   3.50          
Debt covenant, leverage ratio, maximum   4.00          
Line of credit facility, outstanding borrowings             $ 0
Revolving credit facility | The Credit Agreement | Minimum | Base rate              
Debt Instrument [Line Items]              
Basis spread on variable rate             0.00%
Revolving credit facility | The Credit Agreement | Minimum | London interbank offered rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate             0.785%
Revolving credit facility | The Credit Agreement | Maximum | Base rate              
Debt Instrument [Line Items]              
Basis spread on variable rate             0.375%
Revolving credit facility | The Credit Agreement | Maximum | London interbank offered rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate             1.375%
Revolving credit facility | December 17, 2018 credit agreement              
Debt Instrument [Line Items]              
Line of credit facility, increase limit   $ 1,000,000,000          
Senior notes              
Debt Instrument [Line Items]              
Debt redemption percentage of principle amount         101.00%    
Senior notes | 2021 Notes              
Debt Instrument [Line Items]              
Aggregate Principal Amount $ 1,000,000,000           $ 1,000,000,000
Stated interest rate 2.40%            
Unamortized discount $ 3,000,000            
Debt issuance costs 9,200,000            
Proceeds from debt, net of issuance costs $ 987,800,000            
Senior notes | 2.85 Notes due January 15 2030              
Debt Instrument [Line Items]              
Aggregate Principal Amount     $ 500,000,000.0       500,000,000.0
Stated interest rate     2.85%        
Unamortized discount     $ 1,100,000        
Debt issuance costs     4,800,000        
Proceeds from debt, net of issuance costs     494,100,000        
Senior notes | 2015 Senior Notes due 2020              
Debt Instrument [Line Items]              
Repayments of debt     $ 450,000,000        
Senior notes | 2017 Notes              
Debt Instrument [Line Items]              
Aggregate Principal Amount       $ 500,000,000      
Stated interest rate       3.50%      
Unamortized discount       $ 3,100,000      
Debt issuance costs       4,900,000      
Proceeds from debt, net of issuance costs       492,000,000      
Senior notes | Senior Notes due 2017              
Debt Instrument [Line Items]              
Aggregate Principal Amount             500,000,000.0
Repayments of debt       $ 400,000,000      
Senior notes | 2015 Notes              
Debt Instrument [Line Items]              
Aggregate Principal Amount         $ 300,000,000   300,000,000.0
Stated interest rate         4.375%    
Unamortized discount         $ 1,100,000    
Debt issuance costs         2,500,000    
Proceeds from debt, net of issuance costs         $ 296,400,000    
Senior notes | 2012 Senior Notes              
Debt Instrument [Line Items]              
Aggregate Principal Amount           $ 350,000,000 $ 350,000,000.0
Stated interest rate           3.60%  
Unamortized discount           $ 500,000  
Debt issuance costs           2,800,000  
Proceeds from debt, net of issuance costs           $ 346,700,000