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Shareholders' equity - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
director
period
$ / shares
shares
Mar. 31, 2024
USD ($)
shares
Dec. 31, 2024
$ / shares
shares
Class of Stock [Line Items]      
Common shares authorized (in shares) 300,000,000    
Common shares, par value (in dollars per share) | $ / shares $ 0.10    
Dividends paid to common shareholders | $ $ 0.0 $ 0.0  
Dividends paid to preference shareholders | $ 4.0 $ 4.0  
Stock repurchase program, remaining authorized amount | $ $ 180.8    
Director      
Class of Stock [Line Items]      
Common shares repurchased and retired (in shares) 500,000    
Shares acquired price (in dollars per share) | $ / shares $ 14.00    
Common Stock      
Class of Stock [Line Items]      
Common shares repurchased and retired (in shares) 500,000 0  
Preference shares      
Class of Stock [Line Items]      
Preference shares, shares authorized (in shares) 30,000,000    
Preference shares, par value (in dollars per share) | $ / shares $ 0.10    
Series B preference shares      
Class of Stock [Line Items]      
Preference shares, shares authorized (in shares) 8,000,000   8,000,000
Preference shares, par value (in dollars per share) | $ / shares $ 0.10   $ 0.10
Preference shares, shares outstanding (in shares) 8,000,000    
Dividend rate 8.00%    
Voting rights triggering event, number of dividend periods not paid | period 6    
Voting rights triggered, number of directors eligible to elect | director 2    
Dividend rate reset period 5 years    
Dividend rate basis spread on variable rate 7.298%    
Each five-year anniversary triggering event, redemption percentage 100.00%    
Rating agency triggering event, redemption percentage 102.00%    
Capital disqualification triggering event, redemption percentage 100.00%    
Tax triggering event, redemption percentage 100.00%    
Dividends paid to preference shareholders | $ $ 4.0 $ 4.0