Segment Information (Tables)

12 Months Ended

Dec. 31, 2022

Segment Reporting [Abstract]

Premium Income by Major Line of Business within Each Segment

Segment information is shown below. Certain prior year amounts were reclassified to conform to current year presentation.

	Year Ended December 31
	2022		2021		2020
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	1,911.7	$	1,827.8	$	1,828.5
Group Short-term Disability	926.3		864.0		799.2
Group Life and Accidental Death & Dismemberment
Group Life	1,669.1		1,641.9		1,640.5
Accidental Death & Dismemberment	173.7		165.1		163.9
Supplemental and Voluntary
Voluntary Benefits	840.6		846.7		875.2
Individual Disability	461.1		459.8		456.0
Dental and Vision	275.8		272.7		255.6
	6,258.3		6,078.0		6,018.9
Unum International
Unum UK
Group Long-term Disability	376.9		401.9		364.9
Group Life	138.2		112.3		108.5
Supplemental	114.0		112.6		99.8
Unum Poland	89.7		90.2		79.6
	718.8		717.0		652.8
Colonial Life
Accident, Sickness, and Disability	948.9		953.3		975.1
Life	401.1		384.7		376.4
Cancer and Critical Illness	352.0		352.2		360.5
	1,702.0		1,690.2		1,712.0
Closed Block
Long-term Care	697.4		704.3		666.9
All Other	246.9		291.5		327.5
	944.3		995.8		994.4
Total Premium Income	$	9,623.4	$	9,481.0	$	9,378.1

Selected Operating Statement Data by Segment

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Year Ended December 31, 2022
Premium Income	$	6,258.3	$	718.8	$	1,702.0	$	944.3	$	—	$	9,623.4
Net Investment Income	676.3		170.1		152.7		1,070.6		52.5		2,122.2
Other Income	196.3		0.9		1.1		58.0		4.8		261.1
Adjusted Operating Revenue	$	7,130.9	$	889.8	$	1,855.8	$	2,072.9	$	57.3	$	12,006.7
Adjusted Operating Income (Loss)	$	970.7	$	127.0	$	374.6	$	247.9	$	(164.3)	$	1,555.9
Interest and Debt Expense	$	—	$	—	$	—	$	—	$	192.7	$	192.7
Depreciation and Amortization	$	370.6	$	22.0	$	303.5	$	4.7	$	0.6	$	701.4
Year Ended December 31, 2021
Premium Income	$	6,078.0	$	717.0	$	1,690.2	$	995.8	$	—	$	9,481.0
Net Investment Income	721.6		132.7		172.0		1,159.0		27.9		2,213.2
Other Income	170.0		0.6		1.0		65.1		6.2		242.9
Adjusted Operating Revenue	$	6,969.6	$	850.3	$	1,863.2	$	2,219.9	$	34.1	$	11,937.1
Adjusted Operating Income (Loss)	$	464.9	$	105.7	$	329.2	$	394.7	$	(177.9)	$	1,116.6
Interest and Debt Expense	$	—	$	—	$	—	$	—	$	185.0	$	185.0
Depreciation and Amortization	$	400.9	$	21.0	$	275.4	$	5.1	$	0.7	$	703.1
Year Ended December 31, 2020
Premium Income	$	6,018.9	$	652.8	$	1,712.0	$	994.4	$	—	$	9,378.1
Net Investment Income	720.3		104.6		155.7		1,370.3		9.8		2,360.7
Other Income	154.9		0.5		1.1		66.6		1.1		224.2
Adjusted Operating Revenue	$	6,894.1	$	757.9	$	1,868.8	$	2,431.3	$	10.9	$	11,963.0
Adjusted Operating Income (Loss)	$	825.4	$	76.6	$	335.4	$	241.4	$	(200.8)	$	1,278.0
Interest and Debt Expense	$	—	$	—	$	—	$	3.1	$	185.1	$	188.2
Depreciation and Amortization	$	421.7	$	20.1	$	273.9	$	5.9	$	0.7	$	722.3

Deferred Policy Acquisition Costs by Segment

			Unum		Colonial
	Unum US		International		Life		Total
	(in millions of dollars)
Deferred Acquisition Costs
Year Ended December 31, 2022
Beginning of Year	$	1,096.2	$	35.4	$	1,076.3	$	2,207.9
Capitalization	273.1		12.0		271.8		556.9
Amortization	(294.9)		(7.6)		(288.5)		(591.0)
Adjustment Related to Unrealized Investment Gains and Losses	15.0		—		66.7		81.7
Foreign Currency	—		(3.2)		—		(3.2)
End of Year	$	1,089.4	$	36.6	$	1,126.3	$	2,252.3
Year Ended December 31, 2021
Beginning of Year	$	1,168.7	$	32.0	$	1,071.9	$	2,272.6
Capitalization	242.7		12.8		252.6		508.1
Amortization	(319.0)		(8.0)		(259.1)		(586.1)
Adjustment Related to Unrealized Investment Gains and Losses	3.8		—		10.9		14.7
Foreign Currency	—		(1.4)		—		(1.4)
End of Year	$	1,096.2	$	35.4	$	1,076.3	$	2,207.9
Year Ended December 31, 2020
Beginning of Year	$	1,223.0	$	26.4	$	1,074.6	$	2,324.0
Capitalization	291.5		12.1		272.6		576.2
Amortization	(341.0)		(7.4)		(257.7)		(606.1)
Adjustment Related to Unrealized Investment Gains and Losses	(4.8)		—		(17.6)		(22.4)
Foreign Currency	—		0.9		—		0.9
End of Year	$	1,168.7	$	32.0	$	1,071.9	$	2,272.6

Assets by Segment

	December 31
	2022		2021
	(in millions of dollars)
Assets
Unum US	$	16,278.7	$	18,696.3
Unum International	3,154.9		4,086.5
Colonial Life	4,448.9		4,895.9
Closed Block	34,241.2		38,287.9
Corporate	3,311.2		4,149.0
Total Assets	$	61,434.9	$	70,115.6

Reconciliation of Total Revenue and Income Before Income Tax to Adjusted Operating Revenue and Adjusted Operating Income

A reconciliation of total revenue to "adjusted operating revenue" and income before income tax to "adjusted operating income" is as follows:

	Year Ended December 31
	2022		2021		2020
	(in millions of dollars)
Total Revenue	$	11,991.0	$	12,013.8	$	13,162.1
Excluding:
Net Investment Gain (Loss)	(15.7)		76.7		1,199.1
Adjusted Operating Revenue	$	12,006.7	$	11,937.1	$	11,963.0
Income Before Income Tax	$	1,631.4	$	1,063.0	$	964.0
Excluding:
Net Investment Gains and Losses
Net Realized Investment Gain Related to Reinsurance Transaction	—		67.6		1,302.3
Net Investment Gain (Loss), Other	(15.7)		9.1		(103.2)
Total Net Investment Gain (Loss)	(15.7)		76.7		1,199.1
Items Related to Closed Block Individual Disability Reinsurance Transaction
Change in Benefit Reserves and Transaction Costs	—		(139.3)		(1,305.5)
Amortization of the Cost of Reinsurance	(63.8)		(79.1)		(2.6)
Total Items Related to Closed Block Individual Disability Reinsurance Transaction	(63.8)		(218.4)		(1,308.1)
Net Reserve Change Related to Reserve Assumption Updates	155.0		181.4		(169.0)
Impairment Loss on Internal-Use Software	—		(12.1)		—
Cost Related to Early Retirement of Debt	—		(67.3)		—
Impairment Loss on ROU Asset	—		(13.9)		(12.7)
Costs Related to Organizational Design Update	—		—		(23.3)
Adjusted Operating Income	$	1,555.9	$	1,116.6	$	1,278.0