Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2025

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, 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)
Beginning balance, January 1, 2024	$	(328.3)	$	21.9	$	(7.6)	$	(314.0)
Other comprehensive income (loss) before reclassifications	(20.5)		41.4		—		20.9
Amounts reclassified from AOCI(2)	0.8		—		—		0.8
Net current period other comprehensive income (loss)	(19.7)		41.4		—		21.7
Ending balance, March 31, 2024	$	(348.0)	$	63.3	$	(7.6)	$	(292.3)

(1)All amounts are net of tax.

(2)The pretax amounts reclassified from AOCI, $0.2 million and $(1.0) million, are included in Net investment gains (losses) and the related income tax benefits, $0.1 million and $(0.2) million, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2025 and 2024, respectively.