v3.26.1
Segment Information - Schedule of Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Net premiums and contract charges earned $ 316.9 $ 302.6 $ 629.9 $ 600.9
Net investment income 120.5 121.1 231.2 236.9
Other segment income 6.2 4.2 14.0 9.7
Total segment revenues 443.6 427.9 875.1 847.5
Benefits and claims expenses (excluding catastrophe losses) 148.2 137.7 293.7 286.9
Catastrophe losses 24.2 29.7 35.5 46.1
Loss adjustment expenses 18.5 17.1 35.4 33.4
Interest credited 54.6 52.7 108.4 105.5
Operating & admin expenses 84.0 82.2 166.1 159.2
Commissions expense 39.5 37.5 78.7 75.5
Taxes, licenses and fees 8.5 9.3 16.3 16.7
Deferred policy acquisition costs (32.8) (32.0) (64.3) (63.6)
Deferred policy acquisition cost amortization 32.0 29.9 64.3 59.5
Interest expense 9.6 8.6 19.1 17.5
Total segment expenses 386.4 372.8 753.2 736.6
Pretax profit (loss) 57.2 55.1 121.9 110.9
Income tax expense 9.0 10.9 21.2 21.9
Segment profit (loss) (Core earnings) 48.2 44.2 100.7 89.0
Net investment losses (after-tax) (0.1) (4.7) (1.8) (7.3)
Non-core income adjustments (after-tax) (6.5) (10.1) (16.1) (14.0)
Net income 41.6 29.4 82.8 67.6
Property & Casualty        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 205.3 197.3 408.5 390.0
Net investment income 11.8 14.9 26.4 26.6
Other segment income 0.7 0.7 2.7 2.0
Total segment revenues 217.8 212.9 437.6 418.6
Benefits and claims expenses (excluding catastrophe losses) 84.7 89.6 170.6 175.3
Catastrophe losses 24.2 29.7 35.5 46.1
Loss adjustment expenses 18.5 17.1 35.4 33.4
Interest credited 0.0 0.0 0.0 0.0
Operating & admin expenses 34.5 33.4 67.9 66.8
Commissions expense 16.9 16.5 33.3 33.4
Taxes, licenses and fees 5.6 6.1 10.8 11.0
Deferred policy acquisition costs (24.9) (24.7) (48.6) (49.0)
Deferred policy acquisition cost amortization 25.3 23.9 51.1 46.9
Interest expense 0.0 0.0 0.0 0.0
Total segment expenses 184.8 191.6 356.0 363.9
Pretax profit (loss) 33.0 21.3 81.6 54.7
Income tax expense 7.2 4.8 16.8 11.4
Segment profit (loss) (Core earnings) 25.8 16.5 64.8 43.3
Net investment losses (after-tax) 0.0 0.0 0.0 0.0
Non-core income adjustments (after-tax) 0.0 0.0 0.0 0.0
Net income 25.8 16.5 64.8 43.3
Life & Retirement        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 41.0 39.6 80.4 78.1
Net investment income 96.7 97.2 183.7 186.2
Other segment income 5.5 4.9 11.0 9.7
Total segment revenues 143.2 141.7 275.1 274.0
Benefits and claims expenses (excluding catastrophe losses) 31.9 25.2 63.4 61.8
Catastrophe losses 0.0 0.0 0.0 0.0
Loss adjustment expenses 0.0 0.0 0.0 0.0
Interest credited 53.2 51.5 105.6 103.1
Operating & admin expenses 25.1 24.0 50.2 47.9
Commissions expense 11.3 9.8 22.3 19.6
Taxes, licenses and fees 1.2 1.4 2.2 2.3
Deferred policy acquisition costs (6.4) (6.1) (12.8) (12.2)
Deferred policy acquisition cost amortization 6.2 5.7 12.2 11.7
Interest expense 0.0 0.0 0.0 0.0
Total segment expenses 122.5 111.5 243.1 234.1
Pretax profit (loss) 20.7 30.2 32.0 39.9
Income tax expense 4.1 5.6 6.2 7.3
Segment profit (loss) (Core earnings) 16.6 24.6 25.8 32.5
Net investment losses (after-tax) 0.0 0.0 0.0 0.0
Non-core income adjustments (after-tax) 3.6 (4.6) 1.4 (5.7)
Net income 20.1 20.0 27.2 26.8
Supplemental & Group Benefits        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 70.6 65.7 141.0 132.8
Net investment income 10.4 10.6 19.3 20.0
Other segment income (0.9) (1.9) (1.5) (3.0)
Total segment revenues 80.1 74.4 158.8 149.8
Benefits and claims expenses (excluding catastrophe losses) 31.6 22.9 59.7 49.8
Catastrophe losses 0.0 0.0 0.0 0.0
Loss adjustment expenses 0.0 0.0 0.0 0.0
Interest credited 1.4 1.2 2.8 2.4
Operating & admin expenses 21.0 21.1 41.6 38.5
Commissions expense 11.3 11.2 23.1 22.5
Taxes, licenses and fees 1.5 1.7 3.0 3.1
Deferred policy acquisition costs (1.5) (1.2) (2.9) (2.4)
Deferred policy acquisition cost amortization 0.5 0.4 1.0 0.9
Interest expense 0.0 0.0 0.0 0.0
Total segment expenses 65.8 57.3 128.3 114.8
Pretax profit (loss) 14.3 17.1 30.5 35.0
Income tax expense 3.1 3.7 6.7 7.6
Segment profit (loss) (Core earnings) 11.2 13.4 23.8 27.4
Net investment losses (after-tax) 0.0 0.0 0.0 0.0
Non-core income adjustments (after-tax) (2.7) (5.5) (5.4) (8.3)
Net income 8.5 7.9 18.4 19.1
Corporate & Other        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 0.0 0.0 0.0 0.0
Net investment income 1.6 (1.6) 1.8 4.1
Other segment income 0.9 0.5 1.8 1.0
Total segment revenues 2.5 (1.1) 3.6 5.1
Benefits and claims expenses (excluding catastrophe losses) 0.0 0.0 0.0 0.0
Catastrophe losses 0.0 0.0 0.0 0.0
Loss adjustment expenses 0.0 0.0 0.0 0.0
Interest credited 0.0 0.0 0.0 0.0
Operating & admin expenses 3.5 3.7 6.4 6.0
Commissions expense 0.0 0.0 0.0 0.0
Taxes, licenses and fees 0.2 0.1 0.3 0.3
Deferred policy acquisition costs 0.0 0.0 0.0 0.0
Deferred policy acquisition cost amortization 0.0 0.0 0.0 0.0
Interest expense 9.6 8.6 19.1 17.5
Total segment expenses 13.3 12.4 25.8 23.8
Pretax profit (loss) (10.8) (13.5) (22.2) (18.7)
Income tax expense (5.4) (3.2) (8.5) (4.4)
Segment profit (loss) (Core earnings) (5.4) (10.3) (13.7) (14.3)
Net investment losses (after-tax) (0.1) (4.7) (1.8) (7.3)
Non-core income adjustments (after-tax) (7.3) 0.0 (12.1) 0.0
Net income $ (12.8) $ (15.0) $ (27.6) $ (21.6)