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Segment Information - Summary of Segment Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information          
Net premiums and contract charges earned $ 266.0 $ 257.4 $ 782.6 $ 768.6  
Net investment income 118.9 97.6 327.8 300.7  
Net income (loss) 11.7 20.4 5.5 36.5  
Assets 13,412.5   13,412.5   $ 13,306.1
Intersegment eliminations          
Segment Reporting Information          
Net investment income (0.5) (0.5) (1.6) (1.6)  
Assets (58.4)   (58.4)   (64.9)
Property & Casualty | Operating segments          
Segment Reporting Information          
Net premiums and contract charges earned 164.3 152.4 474.1 452.5  
Net investment income 12.0 8.0 26.6 22.9  
Net income (loss) (11.3) (2.5) (44.3) (19.4)  
Assets 1,142.2   1,142.2   1,083.8
Life & Retirement | Operating segments          
Segment Reporting Information          
Net premiums and contract charges earned 38.2 36.8 113.3 108.9  
Net investment income 96.9 81.4 274.1 254.0  
Net income (loss) 20.9 17.7 52.3 57.1  
Assets 10,856.2   10,856.2   10,754.5
Supplemental & Group Benefits | Operating segments          
Segment Reporting Information          
Net premiums and contract charges earned 63.5 68.2 195.2 207.2  
Net investment income 10.3 8.7 28.5 25.4  
Net income (loss) 15.8 20.7 41.6 48.9  
Assets 1,299.8   1,299.8   1,359.3
Corporate & Other          
Segment Reporting Information          
Net investment income 0.2 0.0 0.2 0.0  
Net income (loss) (13.7) $ (15.5) (44.1) $ (50.1)  
Assets $ 172.6   $ 172.6   $ 173.4