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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) The following table reconciles these components.
($ in millions)
Net Unrealized Investment
 Gains (Losses)
 on Fixed Maturity Securities(1)
Net Reserve Remeasurements Attributable to Discount Rates(1)
Net Funded Status of
Benefit Plans(1)
Total(1)
Beginning balance, July 1, 2024$(370.4)$95.3 $(7.6)$(282.7)
Other comprehensive income (loss) before reclassifications132.8 (73.5)— 59.3 
Amounts reclassified from AOCI(2)
0.4 — — 0.4 
Net current period other comprehensive income (loss)133.2 (73.5)— 59.7 
Ending balance, September 30, 2024$(237.2)$21.8 $(7.6)$(223.0)
Beginning balance, July 1, 2023$(393.7)$42.9 $(8.8)$(359.6)
Other comprehensive income (loss) before reclassifications
(143.7)90.7 — (53.0)
Amounts reclassified from AOCI(3)
2.7 — — 2.7 
Net current period other comprehensive income (loss)(141.0)90.7 — (50.3)
Ending balance, September 30, 2023$(534.7)$133.6 $(8.8)$(409.9)
Beginning balance, January 1, 2024$(328.3)$21.9 $(7.6)$(314.0)
Other comprehensive income (loss) before reclassifications88.2 (0.1)— 88.1 
Amounts reclassified from AOCI(2)
2.9 — — 2.9 
Net current period other comprehensive income (loss)91.1 (0.1)— 91.0 
Ending balance, September 30, 2024$(237.2)$21.8 $(7.6)$(223.0)
Beginning balance, January 1, 2023$(449.6)$59.0 $(8.8)$(399.4)
Other comprehensive income (loss) before reclassifications(101.3)74.6 — (26.7)
Amounts reclassified from AOCI(3)
16.2 — — 16.2 
Net current period other comprehensive income (loss)(85.1)74.6 — (10.5)
Ending balance, September 30, 2023$(534.7)$133.6 $(8.8)$(409.9)
(1)All amounts are net of tax.
(2)The pretax amounts reclassified from AOCI, $(0.4) million and $(3.6) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.1) million and $(0.8) million, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2024, respectively.
(3)The pretax amounts reclassified from AOCI, $(3.5) million and $(20.5) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.7) million and $(4.3) million, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2023, respectively.