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Common shares, treasury shares, and dividends - Narrative (Details) - USD ($)
 12 Months Ended 60 Months Ended
Mar. 14, 2022
Jan. 24, 2022
Jan. 28, 2023
Jan. 29, 2022
Jan. 30, 2021
Jan. 28, 2023
Mar. 16, 2023
Jun. 30, 2022
Jan. 21, 2022
Class of Stock [Line Items]                  
Common shares, par value (usd per share)     $ 0.18 $ 0.18   $ 0.18      
Amount repurchased     $ 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%                
Treasury stock reissued (in shares)     5,000,000 2,500,000 0        
Treasury shares retired (in shares)     0 0          
Cumulative undeclared dividends     $ 0 $ 0          
2017 Program                  
Class of Stock [Line Items]                  
Increase to authorized amount       559,400,000       $ 500,000,000  
Stock repurchase program, authorized amount       1,200,000,000       $ 1,700,000,000  
Amount repurchased     426,100,000 261,800,000 $ 0 $ 1,200,000,000      
Remaining authorized repurchase amount     537,300,000     $ 537,300,000      
2017 Program | Subsequent Event                  
Class of Stock [Line Items]                  
Increase to authorized amount             $ 263,000,000    
Stock repurchase program, authorized amount             25,000,000    
Remaining authorized repurchase amount             $ 775,000,000    
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