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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, 2022   114,343,000      
Balance, beginning of period 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 72.9       72.9
Other comprehensive income (loss), net of tax 223.8     223.8  
Common stock repurchased (in shares)   (1,979,000)      
Common stock repurchased (45.1)   (45.1)    
Dividends on common stock (33.8)       (33.8)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,310,000      
Employee benefit plans, net of shares used to pay tax withholdings 9.2   9.2    
Balance, end of period (in shares) at Jun. 30, 2023   113,674,000      
Balance, end of period at Jun. 30, 2023 1,995.8 $ 1.1 1,997.9 (1,733.5) 1,730.3
Balance, beginning of period (in shares) at Mar. 31, 2023   114,905,000      
Balance, beginning of period at Mar. 31, 2023 2,031.8 $ 1.1 2,021.1 (1,664.4) 1,674.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 73.7       73.7
Other comprehensive income (loss), net of tax (69.1)     (69.1)  
Common stock repurchased (in shares)   (1,346,000)      
Common stock repurchased (30.0)   (30.0)    
Dividends on common stock (17.4)       (17.4)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   115,000      
Employee benefit plans, net of shares used to pay tax withholdings 6.8   6.8    
Balance, end of period (in shares) at Jun. 30, 2023   113,674,000      
Balance, end of period at Jun. 30, 2023 $ 1,995.8 $ 1.1 1,997.9 (1,733.5) 1,730.3
Balance, beginning of period (in shares) at Dec. 31, 2023 109,357,540 109,358,000      
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 106,513,566 106,514,000      
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 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 106,513,566 106,514,000      
Balance, end of period at Jun. 30, 2024 $ 2,428.9 $ 1.1 $ 1,797.6 $ (1,464.3) $ 2,094.5