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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 237.9       237.9
Other comprehensive income (loss), net of tax 460.8     460.8  
Common stock repurchased (in shares)   (6,466,000)      
Common stock repurchased (190.0) $ (0.1) (189.9)    
Dividends on common stock (50.8)       (50.8)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,031,000      
Employee benefit plans, net of shares used to pay tax withholdings 14.3   14.3    
Balance, end of period (in shares) at Sep. 30, 2024   103,923,000      
Balance, end of period at Sep. 30, 2024 2,687.8 $ 1.0 1,715.9 (1,116.0) 2,086.9
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 Jun. 30, 2024   106,514,000      
Balance, beginning of period at Jun. 30, 2024 2,428.9 $ 1.1 1,797.6 (1,464.3) 2,094.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 9.3       9.3
Other comprehensive income (loss), net of tax 348.3     348.3  
Common stock repurchased (in shares)   (2,810,000)      
Common stock repurchased (90.0) $ (0.1) (89.9)    
Dividends on common stock (16.9)       (16.9)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   219,000      
Employee benefit plans, net of shares used to pay tax withholdings 8.2   8.2    
Balance, end of period (in shares) at Sep. 30, 2024   103,923,000      
Balance, end of period at Sep. 30, 2024 $ 2,687.8 $ 1.0 1,715.9 (1,116.0) 2,086.9
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 at Mar. 31, 2025         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 136.4       136.4
Other comprehensive income (loss), net of tax 252.5     252.5  
Common stock repurchased (in shares)   (6,675,000)      
Common stock repurchased (259.9)   (259.9)    
Dividends on common stock (50.0)       (50.0)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   897,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 16.8   16.8    
Balance, end of period (in shares) at Sep. 30, 2025 95,840,989 95,841,000      
Balance, end of period at Sep. 30, 2025 $ 2,611.0 $ 1.0 1,389.4 (1,118.9) 2,339.5
Balance, beginning of period (in shares) at Jun. 30, 2025   97,319,000      
Balance, beginning of period at Jun. 30, 2025 2,522.7 $ 1.0 1,441.4 (1,252.7) 2,333.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 23.1       23.1
Other comprehensive income (loss), net of tax 133.8     133.8  
Common stock repurchased (in shares)   (1,570,000)      
Common stock repurchased (60.0)   (60.0)    
Dividends on common stock (16.6)       (16.6)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   92,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 8.0   8.0    
Balance, end of period (in shares) at Sep. 30, 2025 95,840,989 95,841,000      
Balance, end of period at Sep. 30, 2025 $ 2,611.0 $ 1.0 $ 1,389.4 $ (1,118.9) $ 2,339.5