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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Cumulative Effect, Period of Adoption, Adjusted Balance
Common stock
Common stock
Cumulative Effect, Period of Adoption, Adjusted Balance
Additional paid-in capital
Additional paid-in capital
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated other comprehensive income
Accumulated other comprehensive income
Cumulative Effect, Period of Adoption, Adjusted Balance
Retained earnings
Retained earnings
Cumulative Effect, Period of Adoption, Adjustment
Retained earnings
Cumulative Effect, Period of Adoption, Adjusted Balance
Balance, beginning of period (in shares) at Dec. 31, 2019       148,084,000 148,084,000              
Balance, beginning of period at Dec. 31, 2019 $ 4,677.0 $ (17.8) $ 4,659.2 $ 1.5 $ 1.5 $ 2,767.3 $ 2,767.3 $ 1,372.5 $ 1,372.5 $ 535.7 $ (17.8) $ 517.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 60.8                 60.8    
Change in unrealized appreciation (depreciation) of investments (net of applicable income tax expense (benefit)) 147.7             147.7        
Common stock repurchased (in shares)       (7,051,000)                
Common stock repurchased (113.0)     $ (0.1)   (112.9)            
Dividends on common stock (33.4)                 (33.4)    
Employee benefit plans, net of shares used to pay tax withholdings (in shares)       686,000                
Employee benefit plans, net of shares used to pay tax withholdings 9.9         9.9            
Balance, end of period (in shares) at Jun. 30, 2020       141,719,000                
Balance, end of period at Jun. 30, 2020 4,731.2     $ 1.4   2,664.3   1,520.2   545.3    
Balance, beginning of period (in shares) at Mar. 31, 2020       143,610,000                
Balance, beginning of period at Mar. 31, 2020 3,765.8     $ 1.4   2,688.5   595.2   480.7    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 82.0                 82.0    
Change in unrealized appreciation (depreciation) of investments (net of applicable income tax expense (benefit)) 925.0             925.0        
Common stock repurchased (in shares)       (1,968,000)                
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)       77,000                
Employee benefit plans, net of shares used to pay tax withholdings 5.8         5.8            
Balance, end of period (in shares) at Jun. 30, 2020       141,719,000                
Balance, end of period at Jun. 30, 2020 $ 4,731.2     $ 1.4   2,664.3   1,520.2   545.3    
Balance, beginning of period (in shares) at Dec. 31, 2020 135,279,119     135,279,000                
Balance, beginning of period at Dec. 31, 2020 $ 5,484.2     $ 1.3   2,544.5   2,186.1   752.3    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 225.4                 225.4    
Change in unrealized appreciation (depreciation) of investments (net of applicable income tax expense (benefit)) (190.6)             (190.6)        
Common stock repurchased (in shares)       (7,600,000)                
Common stock repurchased (187.4)         (187.4)            
Dividends on common stock (33.5)                 (33.5)    
Employee benefit plans, net of shares used to pay tax withholdings (in shares)       1,426,000                
Employee benefit plans, net of shares used to pay tax withholdings $ 25.9         25.9            
Balance, end of period (in shares) at Jun. 30, 2021 129,105,039     129,105,000                
Balance, end of period at Jun. 30, 2021 $ 5,324.0     $ 1.3   2,383.0   1,995.5   944.2    
Balance, beginning of period (in shares) at Mar. 31, 2021       132,268,000                
Balance, beginning of period at Mar. 31, 2021 4,860.7     $ 1.3   2,457.8   1,518.1   883.5    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 78.0                 78.0    
Change in unrealized appreciation (depreciation) of investments (net of applicable income tax expense (benefit)) 477.4             477.4        
Common stock repurchased (in shares)       (3,491,000)                
Common stock repurchased (87.4)         (87.4)            
Dividends on common stock (17.3)                 (17.3)    
Employee benefit plans, net of shares used to pay tax withholdings (in shares)       328,000                
Employee benefit plans, net of shares used to pay tax withholdings $ 12.6         12.6            
Balance, end of period (in shares) at Jun. 30, 2021 129,105,039     129,105,000                
Balance, end of period at Jun. 30, 2021 $ 5,324.0     $ 1.3   $ 2,383.0   $ 1,995.5   $ 944.2