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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Parent
Preference shares
Series B preference shares
Common shares
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss), net of tax
Change in foreign currency translation adjustment
Unrealized gains (losses) from debt securities held as available for sale investments
Noncontrolling interests
Balance, beginning of period at Dec. 31, 2023     $ 200.0 $ 16.8 $ 1,693.0 $ 601.0 $ 3.1 $ (4.1) $ 7.2  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Issuance of preference shares, net     0.0              
Issuance of common shares, net       0.0 0.0          
Exercise of options       0.2 15.6          
Common shares repurchased and retired       0.0 0.0          
Share compensation         2.6          
Net income           95.9        
Net income attributable to noncontrolling interests $ (1.1)         (1.1)        
Dividends on preference shares           (4.0)        
Change in foreign currency translation adjustment (1.8)             (1.8)    
Unrealized gains (losses) from debt securities held as available for sale investments (18.4)               (18.4)  
Reclassifications from accumulated other comprehensive loss (0.3)               (0.3)  
Balance, end of period at Mar. 31, 2024 2,620.4 $ 2,602.6 200.0 17.0 1,711.2 691.8 (17.4) (5.9) (11.5) $ 17.8
Balance, beginning of period at Dec. 31, 2024 1,938.8   200.0 11.6 945.0 784.9 (4.1) (3.0) (1.1)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Issuance of preference shares, net     0.0              
Issuance of common shares, net       0.1 (0.2)          
Exercise of options       0.0 0.0          
Common shares repurchased and retired       (0.1) (7.7)          
Share compensation         7.6          
Net income           62.0        
Net income attributable to noncontrolling interests (0.4)         (0.4)        
Dividends on preference shares           (4.0)        
Change in foreign currency translation adjustment (0.2)             (0.2)    
Unrealized gains (losses) from debt securities held as available for sale investments 32.7               32.7  
Reclassifications from accumulated other comprehensive loss (2.0)               (2.0)  
Balance, end of period at Mar. 31, 2025 $ 2,026.7 $ 2,025.2 $ 200.0 $ 11.6 $ 944.7 $ 842.5 $ 26.4 $ (3.2) $ 29.6 $ 1.5