We have three principal operating business segments: Unum US, Unum International, and Colonial Life. Our other segments are Closed Block and Corporate.

Segment information is as follows:



	Three Months Ended March 31
	2019		2018
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	452.9	$	441.2
Group Short-term Disability	188.7		176.3
Group Life and Accidental Death & Dismemberment
Group Life	414.4		399.2
Accidental Death & Dismemberment	41.0		38.7
Supplemental and Voluntary
Individual Disability	110.7		104.9
Voluntary Benefits	234.4		229.8
Dental and Vision	59.8		48.7
	1,501.9		1,438.8
Unum International
Group Long-term Disability	87.9		90.8
Group Life	27.2		28.6
Supplemental	38.9		20.2
	154.0		139.6
Colonial Life
Accident, Sickness, and Disability	242.2		231.3
Life	87.6		81.0
Cancer and Critical Illness	89.5		86.0
	419.3		398.3
Closed Block
Individual Disability	98.1		109.4
Long-term Care	163.0		161.3
All Other	2.4		2.6
	263.5		273.3
Total Premium Income	$	2,338.7	$	2,250.0



	Unum US		Unum International		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Three Months Ended March 31, 2019
Premium Income	$	1,501.9	$	154.0	$	419.3	$	263.5	$	—		$	2,338.7
Net Investment Income	182.1		24.8		36.9		346.6		4.3			594.7
Other Income	34.5		—		0.6		18.0		—			53.1
Adjusted Operating Revenue	$	1,718.5	$	178.8	$	456.8	$	628.1	$	4.3		$	2,986.5

Adjusted Operating Income (Loss)	$	252.3	$	29.1	$	85.2	$	31.0	$	(45.4	)	$	352.2

Three Months Ended March 31, 2018
Premium Income	$	1,438.8	$	139.6	$	398.3	$	273.3	$	—		$	2,250.0
Net Investment Income	194.2		27.6		37.3		337.7		5.5			602.3
Other Income	29.0		—		0.3		19.0		1.2			49.5
Adjusted Operating Revenue	$	1,662.0	$	167.2	$	435.9	$	630.0	$	6.7		$	2,901.8

Adjusted Operating Income (Loss)	$	243.9	$	29.8	$	81.0	$	28.9	$	(40.3	)	$	343.3



	March 31		December 31
	2019		2018
	(in millions of dollars)
Assets
Unum US	$	17,802.1	$	17,510.9
Unum International	3,646.6		3,426.8
Colonial Life	4,286.8		4,237.9
Closed Block	35,542.2		34,527.6
Corporate	2,644.0		2,172.4
Total Assets	$	63,921.7	$	61,875.6

We measure and analyze our segment performance on the basis of "adjusted operating revenue" and "adjusted operating income" or "adjusted operating loss", which differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of net realized investment gains and losses as specified in the reconciliations below. We believe adjusted operating revenue and adjusted operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. These performance measures are in accordance with GAAP guidance for segment reporting, but they should not be viewed as a substitute for total revenue, income before income tax, or net income.

Realized investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of realized investment gains or losses. Although we may experience realized investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals. We exclude these items as we believe them to be infrequent or unusual in nature, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

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
	2019		2018
	(in millions of dollars)
Total Revenue	$	2,987.6	$	2,899.6
Excluding:
Net Realized Investment Gain (Loss)	1.1		(2.2		)
Adjusted Operating Revenue	$	2,986.5	$	2,901.8

Income Before Income Tax	$	353.3	$	341.1
Excluding:
Net Realized Investment Gain (Loss)	1.1		(2.2		)
Adjusted Operating Income	$	352.2	$	343.3