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Segment Information - Summary of Segment Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information          
Net premiums and contract charges earned $ 255.8 $ 225.8 $ 511.7 $ 453.4  
Net investment income 105.2 109.2 203.1 204.7  
Net income (loss) (12.5) 46.7 2.0 86.0  
Assets 13,758.5   13,758.5   $ 14,383.9
Intersegment eliminations          
Segment Reporting Information          
Net investment income (0.5) (0.6) (1.1) (1.2)  
Assets (61.7)   (61.7)   (64.8)
Property & Casualty | Operating segments          
Segment Reporting Information          
Net premiums and contract charges earned 149.9 155.0 300.1 310.8  
Net investment income 7.7 21.7 14.9 32.5  
Net income (loss) (25.4) 19.3 (16.9) 47.2  
Assets 1,063.4   1,063.4   1,243.4
Life & Retirement | Operating segments          
Segment Reporting Information          
Net premiums and contract charges earned 36.8 38.5 72.6 77.9  
Net investment income 88.4 81.7 172.6 161.6  
Net income (loss) 17.3 16.5 29.1 27.9  
Assets 11,125.5   11,125.5   12,064.7
Supplemental & Group Benefits | Operating segments          
Segment Reporting Information          
Net premiums and contract charges earned 69.1 32.3 139.0 64.7  
Net investment income 9.6 6.4 16.7 11.8  
Net income (loss) 13.2 12.0 24.4 23.3  
Assets 1,450.6   1,450.6   858.8
Corporate & Other          
Segment Reporting Information          
Net investment income 0.0 0.0 0.0 0.0  
Net income (loss) (17.6) $ (1.1) (34.6) $ (12.4)  
Assets $ 180.7   $ 180.7   $ 281.8