Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 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, 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)
Beginning balance, January 1, 2023	$	(449.6)	$	59.0	$	(8.8)	$	(399.4)
Other comprehensive income (loss) before reclassifications	91.3		(41.2)		—		50.1
Amounts reclassified from AOCI(2)	1.9		—		—		1.9
Net current period other comprehensive income (loss)	93.2		(41.2)		—		52.0
Ending balance, March 31, 2023	$	(356.4)	$	17.8	$	(8.8)	$	(347.4)

(1)All amounts are net of tax.

(2)The pretax amounts reclassified from AOCI, $(1.0) million and $(2.4) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.2) million and $(0.5) million, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2024 and 2023, respectively.