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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common stock
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings
Balance, beginning of period (in shares) at Dec. 31, 2023   109,358,000      
Balance, beginning of period at Dec. 31, 2023 $ 2,215.6 $ 1.1 $ 1,891.5 $ (1,576.8) $ 1,899.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 228.6       228.6
Other comprehensive income (loss), net of tax 112.5     112.5  
Common stock repurchased (in shares)   (3,656,000)      
Common stock repurchased (100.0)   (100.0)    
Dividends on common stock (33.9)       (33.9)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   812,000      
Employee benefit plans, net of shares used to pay tax withholdings 6.1   6.1    
Balance, end of period (in shares) at Jun. 30, 2024   106,514,000      
Balance, end of period at Jun. 30, 2024 2,428.9 $ 1.1 1,797.6 (1,464.3) 2,094.5
Balance, beginning of period (in shares) at Dec. 31, 2023   109,358,000      
Balance, beginning of period at Dec. 31, 2023 2,215.6 $ 1.1 1,891.5 (1,576.8) 1,899.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 420.8        
Balance, end of period (in shares) at Dec. 31, 2024 101,618,957 101,619,000      
Balance, end of period at Dec. 31, 2024 $ 2,515.2 $ 1.0 1,632.5 (1,371.4) 2,253.1
Balance, beginning of period (in shares) at Mar. 31, 2024   108,569,000      
Balance, beginning of period at Mar. 31, 2024 2,367.7 $ 1.1 1,851.2 (1,480.3) 1,995.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 116.3       116.3
Other comprehensive income (loss), net of tax 16.0     16.0  
Common stock repurchased (in shares)   (2,173,000)      
Common stock repurchased (60.0)   (60.0)    
Dividends on common stock (17.5)       (17.5)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   118,000      
Employee benefit plans, net of shares used to pay tax withholdings 6.4   6.4    
Balance, end of period (in shares) at Jun. 30, 2024   106,514,000      
Balance, end of period at Jun. 30, 2024 $ 2,428.9 $ 1.1 1,797.6 (1,464.3) 2,094.5
Balance, beginning of period (in shares) at Dec. 31, 2024 101,618,957 101,619,000      
Balance, beginning of period at Dec. 31, 2024 $ 2,515.2 $ 1.0 1,632.5 (1,371.4) 2,253.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 21.5        
Balance, end of period (in shares) at Mar. 31, 2025   99,894,000      
Balance, end of period at Mar. 31, 2025 $ 2,555.1 $ 1.0 1,535.0 (1,239.1) 2,258.2
Balance, beginning of period (in shares) at Dec. 31, 2024 101,618,957 101,619,000      
Balance, beginning of period at Dec. 31, 2024 $ 2,515.2 $ 1.0 1,632.5 (1,371.4) 2,253.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 113.3       113.3
Other comprehensive income (loss), net of tax 118.7     118.7  
Common stock repurchased (in shares)   (5,105,000)      
Common stock repurchased (199.9)   (199.9)    
Dividends on common stock (33.4)       (33.4)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   805,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 8.8   8.8    
Balance, end of period (in shares) at Jun. 30, 2025 97,319,000 97,319,000      
Balance, end of period at Jun. 30, 2025 $ 2,522.7 $ 1.0 1,441.4 (1,252.7) 2,333.0
Balance, beginning of period (in shares) at Mar. 31, 2025   99,894,000      
Balance, beginning of period at Mar. 31, 2025 2,555.1 $ 1.0 1,535.0 (1,239.1) 2,258.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 91.8       91.8
Other comprehensive income (loss), net of tax (13.6)     (13.6)  
Common stock repurchased (in shares)   (2,624,000)      
Common stock repurchased (100.0)   (100.0)    
Dividends on common stock (17.0)       (17.0)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   49,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 6.4   6.4    
Balance, end of period (in shares) at Jun. 30, 2025 97,319,000 97,319,000      
Balance, end of period at Jun. 30, 2025 $ 2,522.7 $ 1.0 $ 1,441.4 $ (1,252.7) $ 2,333.0