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Common shares, treasury shares, and dividends - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended 72 Months Ended
Mar. 14, 2022
Jan. 24, 2022
May 04, 2024
Feb. 03, 2024
Jan. 28, 2023
Jan. 29, 2022
Feb. 03, 2024
Mar. 20, 2024
Jan. 21, 2022
Class of Stock [Line Items]                  
Common shares, par value (usd per share)       $ 0.18 $ 0.18   $ 0.18    
Amount repurchased       $ 139,300,000 $ 376,100,000 $ 311,800,000      
Accelerated share repurchases, total Value committed to repurchase                 $ 250,000,000
Accelerated share repurchases, payment   $ 250,000,000              
Treasury stock, shares, acquired (in shares) 800,000 2,500,000              
Accelerated share repurchases, initial price paid per share (usd per share)   $ 80              
Accelerated share repurchases, prepayment amount, percent paid up front   80.00%              
Accelerated share repurchases, prepayment amount, percent to be paid upon final settlement 20.00%                
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings       700,000 5,000,000 2,500,000      
Treasury shares retired (in shares)       0 0 0      
Preferred Stock, Amount of Preferred Dividends in Arrears       $ 0 $ 0        
2017 Program                  
Class of Stock [Line Items]                  
Increase to authorized amount       263,000,000 500,000,000 $ 559,000,000 $ 263,000,000    
Stock repurchase program, authorized amount       1,900,000,000     1,900,000,000    
Amount repurchased       139,300,000 426,100,000 261,800,000 1,200,000,000    
Remaining authorized repurchase amount       661,000,000     $ 661,000,000    
2017 Program | Subsequent Event                  
Class of Stock [Line Items]                  
Amount repurchased     $ 7,000,000            
Remaining authorized repurchase amount               $ 850,000,000  
Series A Redeemable Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Dividends on redeemable convertible preferred shares       $ 1,700,000 $ 1,700,000 $ 1,700,000