v3.26.3
Segment Information - Schedule of Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Net premiums and contract charges earned $ 318.0 $ 310.3 $ 947.9 $ 911.2
Net investment income 139.7 119.6 370.9 356.5
Other segment income 7.7 5.3 21.7 15.0
Total segment revenues 465.4 435.2 1,340.5 1,282.7
Benefits and claims expenses (excluding catastrophe losses) 132.7 145.4 426.4 432.3
Catastrophe losses 13.5 9.9 49.0 56.0
Loss adjustment expenses 18.7 18.1 54.1 51.6
Interest credited 55.6 55.7 164.0 161.2
Operating & admin expenses 80.1 84.0 246.2 243.1
Commissions expense 42.1 42.8 120.8 118.3
Taxes, licenses and fees 8.7 8.0 25.0 24.7
Deferred policy acquisition costs (33.9) (38.6) (98.2) (102.1)
Deferred policy acquisition cost amortization 31.9 31.5 96.2 91.0
Interest expense 9.6 8.9 28.7 26.4
Total segment expenses 359.0 365.8 1,112.2 1,102.5
Pretax profit (loss) 106.4 69.4 228.3 180.2
Income tax expense 21.3 12.7 42.5 34.6
Segment profit (loss) (Core earnings) 85.1 56.7 185.8 145.6
Net investment losses (after-tax) (20.6) 2.7 (22.4) (4.6)
Non-core income adjustments (after-tax) (6.0) (1.0) (22.1) (15.0)
Net income (loss) 58.5 58.3 141.3 125.9
Property & Casualty        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 207.1 204.7 615.6 594.7
Net investment income 14.3 14.7 40.7 41.4
Other segment income 1.3 0.6 4.0 2.6
Total segment revenues 222.7 220.0 660.3 638.7
Benefits and claims expenses (excluding catastrophe losses) 86.2 95.2 256.8 270.5
Catastrophe losses 13.5 9.9 49.0 56.0
Loss adjustment expenses 18.7 18.1 54.1 51.6
Interest credited 0.0 0.0 0.0 0.0
Operating & admin expenses 32.7 34.5 100.6 101.3
Commissions expense 17.9 21.2 51.2 54.6
Taxes, licenses and fees 5.9 5.8 16.7 16.8
Deferred policy acquisition costs (25.8) (30.2) (74.4) (79.2)
Deferred policy acquisition cost amortization 25.2 25.1 76.3 72.0
Interest expense 0.0 0.0 0.0 0.0
Total segment expenses 174.3 179.7 530.3 543.6
Pretax profit (loss) 48.4 40.4 130.0 95.0
Income tax expense 9.5 8.5 26.3 19.9
Segment profit (loss) (Core earnings) 38.9 31.8 103.7 75.1
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 (loss) 38.9 31.8 103.7 75.1
Life & Retirement        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 42.0 39.2 122.4 117.3
Net investment income 109.9 94.0 293.6 280.2
Other segment income 5.9 6.1 16.9 15.8
Total segment revenues 157.8 139.3 432.9 413.3
Benefits and claims expenses (excluding catastrophe losses) 26.2 31.2 89.6 93.0
Catastrophe losses 0.0 0.0 0.0 0.0
Loss adjustment expenses 0.0 0.0 0.0 0.0
Interest credited 54.1 54.2 159.7 157.3
Operating & admin expenses 23.7 25.0 73.9 72.9
Commissions expense 12.1 10.9 34.4 30.5
Taxes, licenses and fees 1.2 0.9 3.4 3.2
Deferred policy acquisition costs (6.8) (7.1) (19.6) (19.2)
Deferred policy acquisition cost amortization 6.2 5.9 18.4 17.6
Interest expense 0.0 0.0 0.0 0.0
Total segment expenses 116.7 121.1 359.8 355.3
Pretax profit (loss) 41.1 18.2 73.1 58.0
Income tax expense 7.8 3.1 14.0 10.4
Segment profit (loss) (Core earnings) 33.3 15.1 59.1 47.6
Net investment losses (after-tax) 0.0 0.0 0.0 0.0
Non-core income adjustments (after-tax) 0.9 1.8 2.3 (3.9)
Net income (loss) 34.1 16.9 61.3 43.7
Supplemental & Group Benefits        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 68.9 66.4 209.9 199.2
Net investment income 11.7 11.1 31.0 31.1
Other segment income (0.4) (1.9) (1.9) (4.9)
Total segment revenues 80.2 75.6 239.0 225.4
Benefits and claims expenses (excluding catastrophe losses) 20.3 19.0 80.0 68.8
Catastrophe losses 0.0 0.0 0.0 0.0
Loss adjustment expenses 0.0 0.0 0.0 0.0
Interest credited 1.5 1.5 4.3 3.9
Operating & admin expenses 20.3 21.6 61.9 60.1
Commissions expense 12.1 10.7 35.2 33.2
Taxes, licenses and fees 1.5 1.1 4.5 4.2
Deferred policy acquisition costs (1.3) (1.3) (4.2) (3.7)
Deferred policy acquisition cost amortization 0.5 0.5 1.5 1.4
Interest expense 0.0 0.0 0.0 0.0
Total segment expenses 54.9 53.1 183.2 167.9
Pretax profit (loss) 25.3 22.5 55.8 57.5
Income tax expense 5.9 4.7 12.6 12.3
Segment profit (loss) (Core earnings) 19.4 17.8 43.2 45.2
Net investment losses (after-tax) 0.0 0.0 0.0 0.0
Non-core income adjustments (after-tax) (2.9) (2.8) (8.3) (11.1)
Net income (loss) 16.6 15.0 35.0 34.1
Corporate & Other        
Segment Reporting [Line Items]        
Net premiums and contract charges earned 0.0 0.0 0.0 0.0
Net investment income 3.8 (0.3) 5.6 3.8
Other segment income 0.9 0.5 2.7 1.5
Total segment revenues 4.7 0.2 8.3 5.3
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 3.4 2.8 9.8 8.8
Commissions expense 0.0 0.0 0.0 0.0
Taxes, licenses and fees 0.1 0.2 0.4 0.5
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 8.9 28.7 26.4
Total segment expenses 13.1 11.9 38.9 35.7
Pretax profit (loss) (8.4) (11.7) (30.6) (30.4)
Income tax expense (1.9) (3.6) (10.4) (8.0)
Segment profit (loss) (Core earnings) (6.5) (8.1) (20.2) (22.4)
Net investment losses (after-tax) (20.6) 2.7 (22.4) (4.6)
Non-core income adjustments (after-tax) (4.0) 0.0 (16.1) 0.0
Net income (loss) $ (31.1) $ (5.4) $ (58.7) $ (27.0)