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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 period 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 592.6       592.6
Other comprehensive loss, net of tax (2,211.5)     (2,211.5)  
Common stock repurchased (in shares)   (7,168,000)      
Common stock repurchased (170.0) $ (0.1) (169.9)    
Dividends on common stock (48.7)       (48.7)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   1,158,000      
Employee benefit plans, net of shares used to pay tax withholdings 16.3   16.3    
Balance, end of period (in shares) at Sep. 30, 2022   114,367,000      
Balance, end of period at Sep. 30, 2022 1,863.4 $ 1.1 2,030.6 (1,837.8) 1,669.5
Balance, beginning of period (in shares) at Jun. 30, 2022   114,795,000      
Balance, beginning of period at Jun. 30, 2022 2,127.9 $ 1.1 2,032.7 (1,415.8) 1,509.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 175.9       175.9
Other comprehensive loss, net of tax (422.0)     (422.0)  
Common stock repurchased (in shares)   (561,000)      
Common stock repurchased (10.0)   (10.0)    
Dividends on common stock (16.3)       (16.3)
Employee benefit plans, net of shares used to pay tax withholdings (in shares)   133,000      
Employee benefit plans, net of shares used to pay tax withholdings 7.9   7.9    
Balance, end of period (in shares) at Sep. 30, 2022   114,367,000      
Balance, end of period at Sep. 30, 2022 $ 1,863.4 $ 1.1 2,030.6 (1,837.8) 1,669.5
Balance, beginning of period (in shares) at Dec. 31, 2022 114,343,070 114,343,000      
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 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 112,163,169 112,163,000      
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 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 112,163,169 112,163,000      
Balance, end of period at Sep. 30, 2023 $ 1,890.1 $ 1.1 $ 1,965.3 $ (1,956.7) $ 1,880.4