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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Premium Income by Major Line of Business within Each Segment
Segment information is as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
 
2019
 
2018
 
2019
 
2018
 
(in millions of dollars)
Premium Income
 
 
 
 
 
 
 
Unum US
 
 
 
 
 
 
 
Group Disability
 
 
 
 
 
 
 
Group Long-term Disability
$
457.2

 
$
437.4

 
$
910.1

 
$
878.6

Group Short-term Disability
187.6

 
171.0

 
376.3

 
347.3

Group Life and Accidental Death & Dismemberment
 
 
 
 
 
 
 
Group Life
420.0

 
391.1

 
834.4

 
790.3

Accidental Death & Dismemberment
41.7

 
38.6

 
82.7

 
77.3

Supplemental and Voluntary
 
 
 
 
 
 
 
Individual Disability
108.5

 
104.7

 
219.2

 
209.6

Voluntary Benefits
228.6

 
223.9

 
463.0

 
453.7

Dental and Vision
60.9

 
49.6

 
120.7

 
98.3

 
1,504.5

 
1,416.3

 
3,006.4

 
2,855.1

Unum International
 
 
 
 
 
 
 
Group Long-term Disability
89.6

 
89.7

 
177.5

 
180.5

Group Life
28.8

 
27.9

 
56.0

 
56.5

Supplemental
40.2

 
21.3

 
79.1

 
41.5

 
158.6

 
138.9

 
312.6

 
278.5

Colonial Life
 
 
 
 
 
 
 
Accident, Sickness, and Disability
242.4

 
228.6

 
484.6

 
459.9

Life
88.3

 
81.5

 
175.9

 
162.5

Cancer and Critical Illness
90.2

 
85.3

 
179.7

 
171.3

 
420.9

 
395.4

 
840.2

 
793.7

Closed Block
 
 
 
 
 
 
 
Individual Disability
94.4

 
106.9

 
192.5

 
216.3

Long-term Care
162.6

 
161.5

 
325.6

 
322.8

All Other
2.1

 
2.0

 
4.5

 
4.6

 
259.1

 
270.4

 
522.6

 
543.7

Total Premium Income
$
2,343.1

 
$
2,221.0

 
$
4,681.8

 
$
4,471.0
Selected Operating Statement Data by Segment
 
Unum US
 
Unum International
 
Colonial Life
 
Closed Block
 
Corporate
 
Total
 
(in millions of dollars)
Three Months Ended June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
1,504.5

 
$
158.6

 
$
420.9

 
$
259.1

 
$
—

 
$
2,343.1

Net Investment Income
184.1

 
44.8

 
37.2

 
354.5

 
4.3

 
624.9

Other Income
36.8

 
0.3

 
0.7

 
16.5

 
1.7

 
56.0

Adjusted Operating Revenue
$
1,725.4

 
$
203.7

 
$
458.8

 
$
630.1

 
$
6.0

 
$
3,024.0

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
254.3

 
$
30.7

 
$
84.4

 
$
33.7

 
$
(43.8
)
 
$
359.3

 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
1,416.3

 
$
138.9

 
$
395.4

 
$
270.4

 
$
—

 
$
2,221.0

Net Investment Income
196.5

 
32.1

 
40.2

 
345.6

 
9.2

 
623.6

Other Income
28.8

 
—

 
0.3

 
18.9

 
0.3

 
48.3

Adjusted Operating Revenue
$
1,641.6

 
$
171.0

 
$
435.9

 
$
634.9

 
$
9.5

 
$
2,892.9

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
251.1

 
$
27.6

 
$
84.6

 
$
29.6

 
$
(35.5
)
 
$
357.4


 
Unum US
 
Unum International
 
Colonial Life
 
Closed Block
 
Corporate
 
Total
 
(in millions of dollars)
Six Months Ended June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
3,006.4

 
$
312.6

 
$
840.2

 
$
522.6

 
$
—

 
$
4,681.8

Net Investment Income
366.2

 
69.6

 
74.1

 
701.1

 
8.6

 
1,219.6

Other Income
71.3

 
0.3

 
1.3

 
34.5

 
1.7

 
109.1

Adjusted Operating Revenue
$
3,443.9

 
$
382.5

 
$
915.6

 
$
1,258.2

 
$
10.3

 
$
6,010.5

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
506.6

 
$
59.8

 
$
169.6

 
$
64.7

 
$
(89.2
)
 
$
711.5


 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
2,855.1

 
$
278.5

 
$
793.7

 
$
543.7

 
$
—

 
$
4,471.0

Net Investment Income
390.7

 
59.7

 
77.5

 
683.3

 
14.7

 
1,225.9

Other Income
57.8

 
—

 
0.6

 
37.9

 
1.5

 
97.8

Adjusted Operating Revenue
$
3,303.6

 
$
338.2

 
$
871.8

 
$
1,264.9

 
$
16.2

 
$
5,794.7

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
495.0

 
$
57.4

 
$
165.6

 
$
58.5

 
$
(75.8
)
 
$
700.7
Assets by Segment
 
June 30
 
December 31
 
2019
 
2018
 
(in millions of dollars)
Assets
 
 
 
Unum US
$
18,438.3

 
$
17,510.9

Unum International
3,769.4

 
3,426.8

Colonial Life
4,531.0

 
4,237.9

Closed Block
36,196.7

 
34,527.6

Corporate
2,908.3

 
2,172.4

Total Assets
$
65,843.7

 
$
61,875.6
Reconciliation of Total Revenue and Income before Income Tax by Segment 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 June 30
 
Six Months Ended June 30
 
2019
 
2018
 
2019
 
2018
 
(in millions of dollars)
Total Revenue
$
3,016.7

 
$
2,890.3

 
$
6,004.3

 
$
5,789.9

Excluding:
 
 
 
 
 
 
 
Net Realized Investment Loss
(7.3
)
 
(2.6
)
 
(6.2
)
 
(4.8
)
Adjusted Operating Revenue
$
3,024.0

 
$
2,892.9

 
$
6,010.5

 
$
5,794.7

 
 
 
 
 
 
 
 
Income Before Income Tax
$
352.0

 
$
354.8

 
$
705.3

 
$
695.9

Excluding:
 
 
 
 
 
 
 
Net Realized Investment Loss
(7.3
)
 
(2.6
)
 
(6.2
)
 
(4.8
)
Adjusted Operating Income
$
359.3

 
$
357.4

 
$
711.5

 
$
700.7