Segment Information (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Premium Income by Major Line of Business within Each Segment

Segment information is shown below. Certain prior year amounts were adjusted to conform to current year presentation. See below for more information regarding this update.

	Three Months Ended March 31
	2026		2025
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	498.8	$	504.5
Group Short-term Disability	310.7		278.3
Group Life and Accidental Death & Dismemberment
Group Life	495.4		466.2
Accidental Death & Dismemberment	53.0		48.2
Supplemental and Voluntary
Voluntary Benefits	253.8		234.1
Individual Disability	146.5		168.7
Dental and Vision	82.3		80.9
	1,840.5		1,780.9
Unum International
Unum UK
Group Long-term Disability	104.8		100.2
Group Life	77.0		61.6
Supplemental	50.3		41.9
Unum Poland	54.6		43.0
	286.7		246.7
Colonial Life
Accident, Sickness, and Disability	252.8		247.1
Life	128.3		119.9
Cancer and Critical Illness	91.6		90.3
	472.7		457.3
Closed Block
Long-term Care	159.4		176.2
All Other	34.7		41.8
	194.1		218.0
Total Premium Income	$	2,794.0	$	2,702.9

Selected Operating Statement Data by Segment

	Three Months Ended March 31, 2026
	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Premium Income	$	1,840.5	$	286.7	$	472.7	$	194.1	$	—	$	2,794.0
Net Investment Income	158.3		29.6		46.8		229.1		19.6		483.4
Other Income	66.8		3.3		0.7		11.3		0.7		82.8
Segment Adjusted Operating Revenue	2,065.6		319.6		520.2		434.5		20.3		3,360.2
Policy Benefits	1,127.1		206.3		229.7		392.7		—		1,955.8
Policy Benefits - Remeasurement Loss (Gain)	(31.8)		(2.8)		(12.4)		95.2		—		48.2
Commissions	219.4		31.0		102.9		15.2		—		368.5
Interest and Debt Expense	—		—		—		—		53.1		53.1
Deferral of Acquisition Costs	(91.6)		(9.2)		(89.8)		—		—		(190.6)
Amortization of Deferred Acquisition Costs	68.7		3.4		62.1		—		—		134.2
Other Segment Items1	435.9		60.0		99.9		76.7		10.8		683.3
Benefits and Expenses	1,727.7		288.7		392.4		579.8		63.9		3,052.5
Segment Adjusted Operating Income (Loss)	$	337.9	$	30.9	$	127.8	$	(145.3)	$	(43.6)	$	307.7
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2026 was $21.7 million, $5.5 million, $4.4 million, $1.6 million, and $0.2 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.

	Three Months Ended March 31, 2025
	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Premium Income	$	1,780.9	$	246.7	$	457.3	$	218.0	$	—	$	2,702.9
Net Investment Income	148.9		28.5		42.2		269.7		23.9		513.2
Other Income	71.9		0.1		0.4		9.9		—		82.3
Segment Adjusted Operating Revenue	2,001.7		275.3		499.9		497.6		23.9		3,298.4
Policy Benefits	1,138.6		172.9		226.6		422.2		—		1,960.3
Policy Benefits - Remeasurement Loss (Gain)	(75.4)		(8.8)		(8.5)		3.4		—		(89.3)
Commissions	205.6		22.4		97.3		17.9		—		343.2
Interest and Debt Expense	—		—		—		—		52.0		52.0
Deferral of Acquisition Costs	(84.7)		(5.3)		(82.6)		—		—		(172.6)
Amortization of Deferred Acquisition Costs	65.2		2.5		57.7		—		—		125.4
Other Segment Items1	423.3		52.9		93.7		46.1		13.0		629.0
Benefits and Expenses	1,672.6		236.6		384.2		489.6		65.0		2,848.0
Segment Adjusted Operating Income (Loss)	$	329.1	$	38.7	$	115.7	$	8.0	$	(41.1)	$	450.4
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2025 was $21.3 million, $4.7 million, $4.2 million, $1.5 million, and $0.1 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.

Assets by Segment

	March 31		December 31
	2026		2025
	(in millions of dollars)
Assets
Unum US	$	14,500.9	$	14,635.3
Unum International	3,661.9		3,648.0
Colonial Life	5,332.4		5,289.9
Closed Block	32,503.2		33,887.8
Corporate	6,715.9		6,058.4
Total Assets	$	62,714.3	$	63,519.4

Reconciliation of Total Revenue and Income Before Income Tax to Segment Adjusted Operating Revenue and Segment Adjusted Operating Income (Loss)

A reconciliation of total revenue to "segment adjusted operating revenue" and income before income tax to "segment adjusted operating income" is shown below.

	Three Months Ended March 31
	2026		2025
	(in millions of dollars)
Total Revenue	$	3,355.2	$	3,091.6
Excluding:
Net Investment Loss	(5.0)		(206.8)
Segment Adjusted Operating Revenue	$	3,360.2	$	3,298.4
Income Before Income Tax	$	302.7	$	243.6
Excluding:
Net Investment Loss
Net Investment Loss Related to the Fortitude Re Reinsurance Transaction	—		(175.9)
Net Investment Loss, Other	(5.0)		(30.9)
Total Net Investment Loss	(5.0)		(206.8)
Segment Adjusted Operating Income	$	307.7	$	450.4