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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, 2024   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       21.5
Other comprehensive income (loss), net of tax 132.3     132.3  
Common stock repurchased (in shares)   (2,482,000)      
Common stock repurchased (99.9) $ 0.0 (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   99,894,000      
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, 2025 94,484,339 94,484,000      
Balance, beginning of period at Dec. 31, 2025 $ 2,638.2 $ 0.9 1,336.3 (1,115.0) 2,416.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 37.7       37.7
Other comprehensive income (loss), net of tax (102.6)     (102.6)  
Common stock repurchased (in shares)   (1,435,000)      
Common stock repurchased (60.0)   (60.0)    
Dividends on common stock (16.4)       (16.4)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   746,000      
Employee benefit plans, net of shares used to pay tax withholdings $ 1.5   1.5    
Balance, end of period (in shares) at Mar. 31, 2026 93,795,306 93,795,000      
Balance, end of period at Mar. 31, 2026 $ 2,498.4 $ 0.9 $ 1,277.8 $ (1,217.6) $ 2,437.3