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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 240.2       240.2
Other comprehensive income (loss), net of tax 0.6     0.6  
Common stock repurchased (in shares)   (3,625,000)      
Common stock repurchased (85.1)   (85.1)    
Dividends on common stock (51.0)       (51.0)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,445,000      
Employee benefit plans, net of shares used to pay tax withholdings 16.6   16.6    
Balance, end of period (in shares) at Sep. 30, 2023   112,163,000      
Balance, end of period at Sep. 30, 2023 1,890.1 $ 1.1 1,965.3 (1,956.7) 1,880.4
Balance, beginning of period (in shares) at Jun. 30, 2023   113,674,000      
Balance, beginning of period at Jun. 30, 2023 1,995.8 $ 1.1 1,997.9 (1,733.5) 1,730.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 167.3       167.3
Other comprehensive income (loss), net of tax (223.2)     (223.2)  
Common stock repurchased (in shares)   (1,646,000)      
Common stock repurchased (40.0)   (40.0)    
Dividends on common stock (17.2)       (17.2)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   135,000      
Employee benefit plans, net of shares used to pay tax withholdings 7.4   7.4    
Balance, end of period (in shares) at Sep. 30, 2023   112,163,000      
Balance, end of period at Sep. 30, 2023 $ 1,890.1 $ 1.1 1,965.3 (1,956.7) 1,880.4
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 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 103,922,954 103,923,000      
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 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 103,922,954 103,923,000      
Balance, end of period at Sep. 30, 2024 $ 2,687.8 $ 1.0 $ 1,715.9 $ (1,116.0) $ 2,086.9