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Redeemable preferred shares - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 4 Months Ended 6 Months Ended
May 20, 2024
May 06, 2024
Apr. 15, 2024
Apr. 01, 2024
Oct. 05, 2016
Aug. 03, 2024
May 04, 2024
Jul. 29, 2023
Aug. 03, 2024
Aug. 03, 2024
Jul. 29, 2023
Feb. 03, 2024
Temporary Equity [Line Items]                        
Repurchase of redeemable convertible preferred shares                   $ 541.0 $ 0.0  
Dividends paid on redeemable convertible preferred shares                   $ 14.4 16.4  
Redemption of preferred shares           $ 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     $ 1,050.94 $ 1,050.94    
Preferred share conversion restriction                 $ 110.0      
Stock Redeemed or Called During Period, Shares   100,000   312,500                
Repurchase of redeemable convertible preferred shares $ 129.0   $ 414.1                  
Dividends paid on redeemable convertible preferred shares     2.1                  
Redemption of preferred shares $ 23.9   $ 83.6                  
Professional Fees             $ 1.5          
Payments of stock issuance costs         $ 13.7              
Accumulated accretion of dividends           $ 13.5   $ 11.5 $ 13.5 $ 13.5 11.5 $ 12.4
Accretion to redemption value           $ 0.2   $ 0.4   $ 1.1 $ 0.8