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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Millions
Total
Effect of the Adoption of ASU 2018-12
Common stock, $0.001 par value
Common stock, $0.001 par value
Effect of the Adoption of ASU 2018-12
Additional paid-in capital
Additional paid-in capital
Effect of the Adoption of ASU 2018-12
Retained earnings
Retained earnings
Effect of the Adoption of ASU 2018-12
Accumulated other comprehensive income (loss), net of tax:
Accumulated other comprehensive income (loss), net of tax:
Effect of the Adoption of ASU 2018-12
Treasury stock, at cost
Treasury stock, at cost
Effect of the Adoption of ASU 2018-12
Ending balance at Dec. 31, 2021     $ 0.1   $ 495.3   $ 1,547.0 $ 22.1 $ (50.0) $ (330.5) $ (493.4)  
Ending balance (Accounting Standards Update 2018-12) at Dec. 31, 2021             (0.8) (0.8) [1]        
Increase (Decrease) in Stockholders' Equity                        
Accounting Standards Update [Extensible List] Accounting Standards Update 2018-12                      
Options exercised and conversion of common and restricted stock units         (1.1)              
Share-based compensation expense         6.2              
Net income (loss) $ 36.5 $ 20.6         36.5 20.6        
Dividends, 2023, $0.33 per share; 2022, $0.32 per share             (40.3) 0.1        
Change in net unrealized investment losses on fixed maturity securities                 (843.9) (156.5)    
Change in net reserve remeasurements attributable to discount rates 460.7 460.7             460.7 460.7    
Treasury stock acquired - share repurchase authorization                     (24.0)  
Ending balance at Sep. 30, 2022 1,092.3 15.7 0.1 $ 0.0 500.4 $ 0.0 1,542.4 42.0 (433.2) (26.3) (517.4) $ 0.0
Beginning balance at Jun. 30, 2022     0.1   498.1   1,535.3 35.4 (328.9) (98.3) (507.4)  
Increase (Decrease) in Stockholders' Equity                        
Options exercised and conversion of common and restricted stock units         0.2              
Share-based compensation expense         2.1              
Net income (loss) 20.4 6.5         20.4 6.5        
Dividends, 2023, $0.33 per share; 2022, $0.32 per share             (13.3) 0.1        
Change in net unrealized investment losses on fixed maturity securities                 (215.0) (38.7)    
Change in net reserve remeasurements attributable to discount rates 110.7 110.7             110.7 110.7    
Treasury stock acquired - share repurchase authorization                     (10.0)  
Ending balance at Sep. 30, 2022 1,092.3 15.7 0.1 $ 0.0 500.4 $ 0.0 1,542.4 $ 42.0 (433.2) $ (26.3) (517.4) $ 0.0
Beginning balance at Dec. 31, 2022 1,098.3 $ 10.1 0.1   502.6   1,512.4   (399.4)   (517.4)  
Increase (Decrease) in Stockholders' Equity                        
Options exercised and conversion of common and restricted stock units         (0.8)              
Share-based compensation expense         6.7              
Net income (loss) 5.5           5.5          
Dividends, 2023, $0.33 per share; 2022, $0.32 per share             (41.4)          
Change in net unrealized investment losses on fixed maturity securities                 (85.1)      
Change in net reserve remeasurements attributable to discount rates 74.6               74.6      
Treasury stock acquired - share repurchase authorization                     (6.5)  
Ending balance at Sep. 30, 2023 1,051.3   0.1   508.5   1,476.5   (409.9)   (523.9)  
Beginning balance at Jun. 30, 2023     0.1   505.7   1,478.6   (359.6)   (522.9)  
Increase (Decrease) in Stockholders' Equity                        
Options exercised and conversion of common and restricted stock units         0.3              
Share-based compensation expense         2.5              
Net income (loss) 11.7           11.7          
Dividends, 2023, $0.33 per share; 2022, $0.32 per share             (13.8)          
Change in net unrealized investment losses on fixed maturity securities                 (141.0)      
Change in net reserve remeasurements attributable to discount rates 90.7               90.7      
Treasury stock acquired - share repurchase authorization                     (1.0)  
Ending balance at Sep. 30, 2023 $ 1,051.3   $ 0.1   $ 508.5   $ 1,476.5   $ (409.9)   $ (523.9)  
[1] See Note 1 to the Consolidated Financial Statements for information regarding the adoption of ASU 2018-12.