Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Premium Income by Major Line of Business within Each Segment

Segment information is as follows:

	Year Ended December 31
	2020		2019		2018
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	1,828.5	$	1,823.1	$	1,766.2
Group Short-term Disability	799.2		768.8		706.3
Group Life and Accidental Death & Dismemberment
Group Life	1,640.5		1,662.0		1,583.7
Accidental Death & Dismemberment	163.9		165.7		156.3
Supplemental and Voluntary
Individual Disability	456.0		440.7		425.4
Voluntary Benefits	875.2		910.2		895.7
Dental and Vision	255.6		246.1		202.8
	6,018.9		6,016.6		5,736.4
Unum International
Unum UK
Group Long-term Disability	364.9		353.4		358.9
Group Life	108.5		115.7		110.8
Supplemental	99.8		89.5		81.7
Unum Poland	79.6		71.9		17.4
	652.8		630.5		568.8
Colonial Life
Accident, Sickness, and Disability	975.1		973.4		929.3
Life	376.4		351.6		328.4
Cancer and Critical Illness	360.5		360.0		346.1
	1,712.0		1,685.0		1,603.8
Closed Block
Long-term Care	666.9		651.6		648.3
Individual Disability	319.6		374.3		420.8
All Other	7.9		7.6		8.0
	994.4		1,033.5		1,077.1
Total Premium Income	$	9,378.1	$	9,365.6	$	8,986.1

Selected Operating Statement Data by Segment

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Year Ended December 31, 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
Year Ended December 31, 2019
Premium Income	$	6,016.6	$	630.5	$	1,685.0	$	1,033.5	$	—	$	9,365.6
Net Investment Income	739.4		122.5		148.0		1,404.9		20.5		2,435.3
Other Income	142.8		0.6		3.4		71.3		3.1		221.2
Adjusted Operating Revenue	$	6,898.8	$	753.6	$	1,836.4	$	2,509.7	$	23.6	$	12,022.1
Adjusted Operating Income (Loss)	$	1,031.1	$	107.9	$	344.5	$	137.7	$	(188.6)	$	1,432.6
Interest and Debt Expense	$	—	$	—	$	—	$	5.3	$	172.1	$	177.4
Depreciation and Amortization	$	422.8	$	18.7	$	276.6	$	7.7	$	1.7	$	727.5
Year Ended December 31, 2018
Premium Income	$	5,736.4	$	568.8	$	1,603.8	$	1,077.1	$	—	$	8,986.1
Net Investment Income	778.7		117.2		151.2		1,377.1		29.5		2,453.7
Other Income	118.5		0.4		1.2		75.4		2.7		198.2
Adjusted Operating Revenue	$	6,633.6	$	686.4	$	1,756.2	$	2,529.6	$	32.2	$	11,638.0
Adjusted Operating Income (Loss)	$	1,014.6	$	113.9	$	335.2	$	125.5	$	(171.1)	$	1,418.1
Interest and Debt Expense	$	—	$	—	$	—	$	6.9	$	160.4	$	167.3
Depreciation and Amortization	$	389.6	$	17.6	$	257.3	$	8.3	$	1.0	$	673.8

Deferred Policy Acquisition Costs by Segment

			Unum		Colonial
	Unum US		International		Life		Total
	(in millions of dollars)
Deferred Acquisition Costs
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
Year Ended December 31, 2019
Beginning of Year	$	1,239.4	$	20.0	$	1,050.0	$	2,309.4
Capitalization	334.5		12.8		311.3		658.6
Amortization	(344.0)		(7.1)		(258.8)		(609.9)
Adjustment Related to Unrealized Investment Gains and Losses	(6.9)		—		(27.9)		(34.8)
Foreign Currency	—		0.7		—		0.7
End of Year	$	1,223.0	$	26.4	$	1,074.6	$	2,324.0
Year Ended December 31, 2018
Beginning of Year	$	1,205.4	$	21.3	$	957.9	$	2,184.6
Capitalization	344.0		8.1		315.9		668.0
Amortization	(315.1)		(8.2)		(242.2)		(565.5)
Adjustment Related to Unrealized Investment Gains and Losses	5.1		—		18.4		23.5
Foreign Currency	—		(1.2)		—		(1.2)
End of Year	$	1,239.4	$	20.0	$	1,050.0	$	2,309.4

Assets by Segment

	December 31
	2020		2019
	(in millions of dollars)
Assets
Unum US	$	19,034.2	$	18,586.3
Unum International	4,206.2		3,869.1
Colonial Life	4,864.3		4,629.0
Closed Block	38,187.2		37,008.7
Corporate	4,333.9		2,920.3
Total Assets	$	70,625.8	$	67,013.4

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
	2020		2019		2018
	(in millions of dollars)
Total Revenue	$	13,162.1	$	11,998.9	$	11,598.5
Excluding:
Net Realized Investment Gain (Loss)	1,199.1		(23.2)		(39.5)
Adjusted Operating Revenue	$	11,963.0	$	12,022.1	$	11,638.0
Income Before Income Tax	$	964.0	$	1,382.1	$	627.8
Excluding:
Net Realized Investment Gains and Losses
Net Realized Investment Gain Related to Reinsurance Transaction	1,302.3		—		—
Net Realized Investment Loss, Other	(103.2)		(23.2)		(39.5)
Total Net Realized Investment Gain (Loss)	1,199.1		(23.2)		(39.5)
Items Related to Closed Block Individual Disability Reinsurance Transaction
Change in Benefit Reserves and Transaction Costs	(1,305.5)		—		—
Amortization of the Cost of Reinsurance	(2.6)		—		—
Total Items Related to Closed Block Individual Disability Reinsurance Transaction	(1,308.1)		—		—
Long-term Care Reserve Increase	(151.5)		—		(750.8)
Group Pension Reserve Increase	(17.5)		—		—
Impairment Loss on ROU Asset	(12.7)		—		—
Costs Related to Organizational Design Update	(23.3)		—		—
Costs Related to Early Retirement of Debt	—		(27.3)		—
Adjusted Operating Income	$	1,278.0	$	1,432.6	$	1,418.1