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Redeemable preferred shares - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 08, 2024
Sep. 16, 2024
May 06, 2024
Apr. 15, 2024
Apr. 01, 2024
Oct. 05, 2016
Nov. 02, 2024
Aug. 03, 2024
May 04, 2024
Oct. 28, 2023
Nov. 02, 2024
Oct. 28, 2023
Mar. 30, 2024
Feb. 03, 2024
Temporary Equity [Line Items]                            
Repurchase of redeemable convertible preferred shares                     $ 812.9 $ 0.0    
Dividends paid on redeemable convertible preferred shares                     18.5 24.6    
Redemption of preferred shares             $ 49.2 $ 23.9 $ 87.2          
Series A Redeemable Convertible Preferred Stock                            
Temporary Equity [Line Items]                            
Redeemable convertible preferred stock, shares issued (in shares)           625,000                
Preferred stock, purchase price           $ 625.0                
Shares issued, price per share (usd per share)           $ 1,000                
Temporary Equity, Redemption Price Per Share                         $ 1,050.94  
Stock Redeemed or Called During Period, Shares 102,500 110,000 100,000   312,500                  
Repurchase of redeemable convertible preferred shares $ 136.7 $ 135.8 $ 129.0 $ 414.1                    
Dividends paid on redeemable convertible preferred shares       2.1                    
Redemption of preferred shares $ 28.2 $ 19.7 $ 23.9 $ 83.6                    
Professional Fees                 $ 1.6          
Accrued Professional Fees             0.9       0.9      
Payments of stock issuance costs           $ 13.7                
Accumulated accretion of dividends                   $ 12.0   12.0   $ 12.4
Accretion to redemption value             $ 0.2     $ 0.5 $ 1.3 $ 1.3