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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, 2021   120,377,000      
Balance, beginning of year at Dec. 31, 2021 $ 3,684.7 $ 1.2 $ 2,184.2 $ 373.7 $ 1,125.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 630.6       630.6
Other comprehensive (loss) income, net of tax $ (2,331.0)     (2,331.0)  
Common stock repurchased (in shares) (7,600,000) (7,612,000)      
Common stock repurchased $ (180.0) $ (0.1) (179.9)    
Dividends on common stock (65.0)       (65.0)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,578,000      
Employee benefit plans, net of shares used to pay tax withholdings 29.5   29.5    
Balance, end of period (in shares) at Dec. 31, 2022   114,343,000      
Balance, end of year at Dec. 31, 2022 1,768.8 $ 1.1 2,033.8 (1,957.3) 1,691.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 276.5       276.5
Other comprehensive (loss) income, net of tax $ 380.5     380.5  
Common stock repurchased (in shares) (6,600,000) (6,557,000)      
Common stock repurchased $ (165.1)   (165.1)    
Dividends on common stock (67.9)       (67.9)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,572,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 22.8   22.8    
Balance, end of period (in shares) at Dec. 31, 2023 109,357,540 109,358,000      
Balance, end of year 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 404.0       404.0
Other comprehensive (loss) income, net of tax $ 205.4     205.4  
Common stock repurchased (in shares) (8,900,000) (8,943,000)      
Common stock repurchased $ (281.6) $ (0.1) (281.5)    
Dividends on common stock (67.5)       (67.5)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,204,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 22.5   22.5    
Balance, end of period (in shares) at Dec. 31, 2024 101,618,957 101,619,000      
Balance, end of year at Dec. 31, 2024 $ 2,498.4 $ 1.0 $ 1,632.5 $ (1,371.4) $ 2,236.3