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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 112.3       112.3
Other comprehensive income (loss), net of tax 96.5     96.5  
Common stock repurchased (in shares)   (1,483,000)      
Common stock repurchased (40.0)   (40.0)    
Dividends on common stock (16.4)       (16.4)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   694,000      
Employee benefit plans, net of shares used to pay tax withholdings (0.3)   (0.3)    
Balance, end of period (in shares) at Mar. 31, 2024   108,569,000      
Balance, end of period at Mar. 31, 2024 $ 2,367.7 $ 1.1 1,851.2 (1,480.3) 1,995.7
Balance, beginning of period (in shares) at Dec. 31, 2024 101,618,957 101,619,000      
Balance, beginning of period at Dec. 31, 2024 $ 2,498.4 $ 1.0 1,632.5 (1,371.4) 2,236.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 13.7       13.7
Other comprehensive income (loss), net of tax 132.3     132.3  
Common stock repurchased (in shares)   (2,482,000)      
Common stock repurchased (99.9)   (99.9)    
Dividends on common stock (16.4)       (16.4)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   757,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 2.4   2.4    
Balance, end of period (in shares) at Mar. 31, 2025 99,893,923 99,894,000      
Balance, end of period at Mar. 31, 2025 $ 2,530.5 $ 1.0 $ 1,535.0 $ (1,239.1) $ 2,233.6