Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2026

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, January 1, 2026	$	(245.5)	$	93.4	$	(2.5)	$	(154.6)
Other comprehensive income (loss) before reclassifications	(42.9)		22.7		—		(20.2)
Amounts reclassified from AOCI(2)	(0.4)		—		—		(0.4)
Net current period other comprehensive income (loss)	(43.3)		22.7		—		(20.6)
Ending balance, March 31, 2026	$	(288.8)	$	116.1	$	(2.5)	$	(175.2)
Beginning balance, January 1, 2025	$	(357.4)	$	110.9	$	(7.0)	$	(253.5)
Other comprehensive income (loss) before reclassifications	43.0		(11.8)		—		31.2
Amounts reclassified from AOCI(2)	(0.1)		—		—		(0.1)
Net current period other comprehensive income (loss)	42.9		(11.8)		—		31.1
Ending balance, March 31, 2025	$	(314.5)	$	99.1	$	(7.0)	$	(222.4)

(1)All amounts are net of tax.

(2)The pretax amounts reclassified from AOCI, $0.5 million and $0.2 million, are included in Net investment gains (losses) and the related income tax benefits, $0.1 million and $0.1 million, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2026 and 2025, respectively.