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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative change related to the adoption of ASU 2023-02
Cumulative effect, period of adoption, adjusted balance
Common Stock Including Additional Paid in Capital [Member]
Common Stock Including Additional Paid in Capital [Member]
Cumulative change related to the adoption of ASU 2023-02
Common Stock Including Additional Paid in Capital [Member]
Cumulative effect, period of adoption, adjusted balance
Retained earnings
Retained earnings
Cumulative change related to the adoption of ASU 2023-02
Retained earnings
Cumulative effect, period of adoption, adjusted balance
Accumulated other comprehensive loss
Accumulated other comprehensive loss
Cumulative change related to the adoption of ASU 2023-02
Accumulated other comprehensive loss
Cumulative effect, period of adoption, adjusted balance
Equity, beginning balance at Dec. 31, 2023 $ 3,227.5 $ 1.2 $ 3,228.7 $ 2,448.9 $ 0.0 $ 2,448.9 $ 1,135.1 $ 1.2 $ 1,136.3 $ (356.5) $ 0.0 $ (356.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 173.9     0.0     173.9     0.0    
Other comprehensive income (loss), net of tax expense $ 101.6     0.0     0.0     101.6    
Stock repurchased and retired (in shares) 49,420                      
Non-vested common shares issued (in shares) 742,979                      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited 105,322                      
Common stock transactions:                        
Common shares purchased and retired $ (1.2)     (1.2)     0.0     0.0    
Non-vested common shares issued 0.0     0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0     0.0     0.0     0.0    
Stock-based compensation expense $ 9.7     9.7     0.0     0.0    
Common dividends (in dollars per share) $ 1.41                      
Common cash dividend declared $ (146.9)     0.0     (146.9)     0.0    
Equity, ending balance at Sep. 30, 2024 3,365.8     2,457.4     1,163.3     (254.9)    
Equity, beginning balance at Jun. 30, 2024 3,225.3     2,453.9     1,156.9     (385.5)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 55.5     0.0     55.5     0.0    
Other comprehensive income (loss), net of tax expense $ 130.6     0.0     0.0     130.6    
Stock repurchased and retired (in shares) 3,972                      
Non-vested common shares issued (in shares) 4,881                      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited 31,664                      
Common stock transactions:                        
Common shares purchased and retired $ (0.1)     (0.1)     0.0     0.0    
Non-vested common shares issued 0.0     0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0     0.0     0.0     0.0    
Stock-based compensation expense $ 3.6     3.6     0.0     0.0    
Common dividends (in dollars per share) $ 0.47                      
Common cash dividend declared $ (49.1)     0.0     (49.1)     0.0    
Equity, ending balance at Sep. 30, 2024 3,365.8     2,457.4     1,163.3     (254.9)    
Equity, beginning balance at Dec. 31, 2024 3,304.0     2,459.5     1,166.4     (321.9)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 193.3     0.0     193.3     0.0    
Other comprehensive income (loss), net of tax expense $ 117.8     0.0     0.0     117.8    
Stock repurchased and retired (in shares) 952,074                      
Common shares issued $ 0.0     0.0     0.0     0.0    
Non-vested common shares issued (in shares) 482,597                      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited 188,288                      
Common stock transactions:                        
Common shares purchased and retired $ (30.7)     (30.7)     0.0     0.0    
Non-vested common shares issued 0.0     0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0     0.0     0.0     0.0    
Stock-based compensation expense $ 10.5     10.5     0.0     0.0    
Common dividends (in dollars per share) $ 1.41                      
Common cash dividend declared $ (146.2)     0.0     (146.2)     0.0    
Equity, ending balance at Sep. 30, 2025 3,448.7     2,439.3     1,213.5     (204.1)    
Equity, beginning balance at Jun. 30, 2025 3,421.8     2,463.5     1,191.2     (232.9)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 71.4     0.0     71.4     0.0    
Other comprehensive income (loss), net of tax expense $ 28.8     0.0     0.0     28.8    
Stock repurchased and retired (in shares) 844,426                      
Common shares issued $ 0.0     0.0     0.0     0.0    
Non-vested common shares issued (in shares) 2,308                      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited 68,508                      
Common stock transactions:                        
Common shares purchased and retired $ (27.5)     (27.5)     0.0     0.0    
Non-vested common shares issued 0.0     0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0     0.0     0.0     0.0    
Stock-based compensation expense $ 3.3     3.3     0.0     0.0    
Common dividends (in dollars per share) $ 0.47                      
Common cash dividend declared $ (49.1)     0.0     (49.1)     0.0    
Equity, ending balance at Sep. 30, 2025 $ 3,448.7     $ 2,439.3     $ 1,213.5     $ (204.1)