Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Premium Income by Major Line of Business within Each Segment

Segment information is as follows:

	Three Months Ended March 31
	2021		2020
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	457.7	$	463.0
Group Short-term Disability	215.2		203.2
Group Life and Accidental Death & Dismemberment
Group Life	410.0		414.5
Accidental Death & Dismemberment	41.4		41.7
Supplemental and Voluntary
Individual Disability	115.7		109.5
Voluntary Benefits	218.7		230.4
Dental and Vision	67.1		65.4
	1,525.8		1,527.7
Unum International
Unum UK
Group Long-term Disability	97.1		90.8
Group Life	27.3		30.9
Supplemental	28.0		23.9
Unum Poland	22.0		19.0
	174.4		164.6
Colonial Life
Accident, Sickness, and Disability	240.7		249.3
Life	96.6		93.8
Cancer and Critical Illness	89.1		91.6
	426.4		434.7
Closed Block
Long-term Care	177.4		164.8
Individual Disability	72.1		77.0
All Other	2.2		2.6
	251.7		244.4
Total Premium Income	$	2,378.3	$	2,371.4

Selected Operating Statement Data by Segment

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Three Months Ended March 31, 2021
Premium Income	$	1,525.8	$	174.4	$	426.4	$	251.7	$	—	$	2,378.3
Net Investment Income	179.7		26.0		37.7		297.2		8.1		548.7
Other Income	40.4		0.1		0.2		18.4		1.3		60.4
Adjusted Operating Revenue	$	1,745.9	$	200.5	$	464.3	$	567.3	$	9.4	$	2,987.4
Adjusted Operating Income (Loss)	$	115.7	$	26.4	$	73.3	$	97.0	$	(38.9)	$	273.5
Three Months Ended March 31, 2020
Premium Income	$	1,527.7	$	164.6	$	434.7	$	244.4	$	—	$	2,371.4
Net Investment Income	179.6		26.5		37.7		336.1		5.1		585.0
Other Income	40.2		—		0.3		18.2		—		58.7
Adjusted Operating Revenue	$	1,747.5	$	191.1	$	472.7	$	598.7	$	5.1	$	3,015.1
Adjusted Operating Income (Loss)	$	261.8	$	19.4	$	81.1	$	29.7	$	(45.9)	$	346.1

Assets by Segment

	March 31		December 31
	2021		2020
	(in millions of dollars)
Assets
Unum US	$	18,563.1	$	19,034.2
Unum International	4,163.6		4,206.2
Colonial Life	4,817.3		4,864.3
Closed Block	37,845.1		38,187.2
Corporate	3,867.5		4,333.9
Total Assets	$	69,256.6	$	70,625.8

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:

	Three Months Ended March 31
	2021		2020
	(in millions of dollars)
Total Revenue	$	3,072.0	$	2,871.1
Excluding:
Net Realized Investment Gain (Loss)	84.6		(144.0)
Adjusted Operating Revenue	$	2,987.4	$	3,015.1
Income Before Income Tax	$	198.8	$	202.1
Excluding:
Net Realized Investment Gains and Losses
Net Realized Investment Gain Related to Reinsurance Transaction	67.6		—
Net Realized Investment Gain (Loss), Other	17.0		(144.0)
Total Net Realized Investment Gain (Loss)	84.6		(144.0)
Items Related to Closed Block Individual Disability Reinsurance Transaction
Change in Benefit Reserves and Transaction Costs	(139.3)		—
Amortization of the Cost of Reinsurance	(20.0)		—
Total Items Related to Closed Block Individual Disability Reinsurance Transaction	(159.3)		—
Adjusted Operating Income	$	273.5	$	346.1