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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Premium Income by Major Line of Business within Each Segment
Segment information is as follows:
 
Three Months Ended September 30
 
Nine Months Ended September 30
 
2018
 
2017
 
2018
 
2017
 
(in millions of dollars)
Premium Income
 
 
 
 
 
 
 
Unum US
 
 
 
 
 
 
 
Group Disability
 
 
 
 
 
 
 
Group Long-term Disability
$
444.1

 
$
435.2

 
$
1,322.7

 
$
1,307.3

Group Short-term Disability
180.4

 
161.1

 
527.7

 
477.3

Group Life and Accidental Death & Dismemberment
 
 
 
 
 
 
 
Group Life
399.3

 
370.0

 
1,189.6

 
1,101.7

Accidental Death & Dismemberment
39.6

 
37.2

 
116.9

 
110.5

Supplemental and Voluntary
 
 
 
 
 
 
 
Individual Disability
109.5

 
104.4

 
319.1

 
318.1

Voluntary Benefits
222.3

 
210.8

 
676.0

 
639.2

Dental and Vision
51.0

 
42.2

 
149.3

 
124.9

 
1,446.2

 
1,360.9

 
4,301.3

 
4,079.0

Unum UK
 
 
 
 
 
 
 
Group Long-term Disability
91.3

 
87.0

 
271.8

 
251.6

Group Life
27.1

 
26.7

 
83.6

 
76.9

Supplemental
19.6

 
17.8

 
61.1

 
51.1

 
138.0

 
131.5

 
416.5

 
379.6

Colonial Life
 
 
 
 
 
 
 
Accident, Sickness, and Disability
231.9

 
222.3

 
691.8

 
661.5

Life
81.4

 
74.6

 
243.9

 
223.8

Cancer and Critical Illness
86.7

 
81.8

 
258.0

 
244.0

 
400.0

 
378.7

 
1,193.7

 
1,129.3

Closed Block
 
 
 
 
 
 
 
Individual Disability
102.7

 
117.9

 
319.0

 
357.7

Long-term Care
163.0

 
162.4

 
485.8

 
486.4

All Other
1.9

 
2.2

 
6.5

 
6.7

 
267.6

 
282.5

 
811.3

 
850.8

Total Premium Income
$
2,251.8

 
$
2,153.6

 
$
6,722.8

 
$
6,438.7
Selected Operating Statement Data by Segment
 
Unum US
 
Unum UK
 
Colonial Life
 
Closed Block
 
Corporate
 
Total
 
(in millions of dollars)
Three Months Ended September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
1,446.2

 
$
138.0

 
$
400.0

 
$
267.6

 
$
—

 
$
2,251.8

Net Investment Income
200.3

 
26.4

 
36.7

 
348.0

 
7.8

 
619.2

Other Income
30.7

 
—

 
0.4

 
18.9

 
0.1

 
50.1

Adjusted Operating Revenue
$
1,677.2

 
$
164.4

 
$
437.1

 
$
634.5

 
$
7.9

 
$
2,921.1

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
270.9

 
$
26.1

 
$
84.2

 
$
32.2

 
$
(47.1
)
 
$
366.3

 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
1,360.9

 
$
131.5

 
$
378.7

 
$
282.5

 
$
—

 
$
2,153.6

Net Investment Income
201.0

 
28.5

 
36.0

 
337.2

 
6.3

 
609.0

Other Income
26.5

 
0.6

 
0.3

 
18.9

 
0.4

 
46.7

Adjusted Operating Revenue
$
1,588.4

 
$
160.6

 
$
415.0

 
$
638.6

 
$
6.7

 
$
2,809.3

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
258.4

 
$
26.5

 
$
81.7

 
$
26.6

 
$
(36.2
)
 
$
357.0


 
Unum US
 
Unum UK
 
Colonial Life
 
Closed Block
 
Corporate
 
Total
 
(in millions of dollars)
Nine Months Ended September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
4,301.3

 
$
416.5

 
$
1,193.7

 
$
811.3

 
$
—

 
$
6,722.8

Net Investment Income
591.0

 
86.1

 
114.2

 
1,031.3

 
22.5

 
1,845.1

Other Income
88.5

 
—

 
1.0

 
56.8

 
1.6

 
147.9

Adjusted Operating Revenue
$
4,980.8

 
$
502.6

 
$
1,308.9

 
$
1,899.4

 
$
24.1

 
$
8,715.8

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
765.9

 
$
83.5

 
$
249.8

 
$
90.7

 
$
(122.9
)
 
$
1,067.0

 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Premium Income
$
4,079.0

 
$
379.6

 
$
1,129.3

 
$
850.8

 
$
—

 
$
6,438.7

Net Investment Income
609.1

 
88.3

 
107.8

 
1,012.5

 
14.2

 
1,831.9

Other Income
85.3

 
0.6

 
0.8

 
59.9

 
1.5

 
148.1

Adjusted Operating Revenue
$
4,773.4

 
$
468.5

 
$
1,237.9

 
$
1,923.2

 
$
15.7

 
$
8,418.7

 
 
 
 
 
 
 
 
 
 
 
 
Adjusted Operating Income (Loss)
$
745.3

 
$
82.0

 
$
245.9

 
$
90.8

 
$
(113.6
)
 
$
1,050.4
Assets by Segment
 
September 30
 
December 31
 
2018
 
2017
 
(in millions of dollars)
Assets
 
 
 
Unum US
$
17,297.1

 
$
18,109.1

Unum UK
3,211.3

 
3,428.1

Colonial Life
4,145.2

 
4,184.1

Closed Block
34,360.5

 
35,051.2

Corporate
3,235.7

 
3,240.6

Total Assets
$
62,249.8

 
$
64,013.1
Reconciliation of Total Revenue and Income (Loss) before Income Tax by Segment to Adjusted Operating Revenue and Adjusted Operating Income
A reconciliation of total revenue to "adjusted operating revenue" and income (loss) before income tax to "adjusted operating income" is as follows:
 
Three Months Ended September 30
 
Nine Months Ended September 30
 
2018
 
2017
 
2018
 
2017
 
(in millions of dollars)
Total Revenue
$
2,927.8

 
$
2,819.1

 
$
8,717.7

 
$
8,447.6

Excluding:
 
 
 
 
 
 
 
Net Realized Investment Gain
6.7

 
9.8

 
1.9

 
28.9

Adjusted Operating Revenue
$
2,921.1

 
$
2,809.3

 
$
8,715.8

 
$
8,418.7

 
 
 
 
 
 
 
 
Income (Loss) Before Income Tax
$
(377.8
)
 
$
366.8

 
$
318.1

 
$
1,058.7

Excluding:
 
 
 
 
 
 
 
Net Realized Investment Gain
6.7

 
9.8

 
1.9

 
28.9

Loss from Guaranty Fund Assessment
—

 
—

 
—

 
(20.6
)
Long-term Care Reserve Increase
(750.8
)
 
—

 
(750.8
)
 
—

Adjusted Operating Income
$
366.3

 
$
357.0

 
$
1,067.0

 
$
1,050.4