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Segment Information (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Segment Reporting [Abstract] |
Premium Income by Major Line of Business within Each Segment | Segment information is as follows:
| Three Months Ended March 31
| 2018 |  | 2017
| (in millions of dollars)
Premium Income |  |  |
Unum US |  |  |
Group Disability |  |  |
Group Long-term Disability | $ | 441.2 |  |  | $ | 434.4 |
Group Short-term Disability | 176.3 |  |  | 157.9 |
Group Life and Accidental Death & Dismemberment |  |  |
Group Life | 399.2 |  |  | 367.8 |
Accidental Death & Dismemberment | 38.7 |  |  | 36.6 |
Supplemental and Voluntary |  |  |
Individual Disability | 104.9 |  |  | 107.0 |
Voluntary Benefits | 229.8 |  |  | 215.2 |
Dental and Vision | 48.7 |  |  | 41.5 |
| 1,438.8 |  |  | 1,360.4 |
Unum UK |  |  |
Group Long-term Disability | 90.8 |  |  | 80.8 |
Group Life | 28.6 |  |  | 24.8 |
Supplemental | 20.2 |  |  | 15.7 |
| 139.6 |  |  | 121.3 |
Colonial Life |  |  |
Accident, Sickness, and Disability | 231.3 |  |  | 219.1 |
Life | 81.0 |  |  | 74.2 |
Cancer and Critical Illness | 86.0 |  |  | 81.0 |
| 398.3 |  |  | 374.3 |
Closed Block |  |  |
Individual Disability | 109.4 |  |  | 121.3 |
Long-term Care | 161.3 |  |  | 163.1 |
All Other | 2.6 |  |  | 2.5 |
| 273.3 |  |  | 286.9 |
Total Premium Income | $ | 2,250.0 |  |  | $ | 2,142.9 |
Selected Operating Statement Data by Segment |
| Unum US |  | Unum UK |  | Colonial Life |  | Closed Block |  | Corporate |  | Total
| (in millions of dollars)
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 |
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Premium Income | $ | 1,360.4 |  |  | $ | 121.3 |  |  | $ | 374.3 |  |  | $ | 286.9 |  |  | $ | — |  |  | $ | 2,142.9 |
Net Investment Income | 202.5 |  |  | 26.6 |  |  | 35.1 |  |  | 335.3 |  |  | 2.9 |  |  | 602.4 |
Other Income | 28.7 |  |  | — |  |  | 0.3 |  |  | 20.8 |  |  | 0.4 |  |  | 50.2 |
Adjusted Operating Revenue | $ | 1,591.6 |  |  | $ | 147.9 |  |  | $ | 409.7 |  |  | $ | 643.0 |  |  | $ | 3.3 |  |  | $ | 2,795.5 |
Adjusted Operating Income (Loss) | $ | 239.1 |  |  | $ | 26.6 |  |  | $ | 82.4 |  |  | $ | 31.6 |  |  | $ | (39.8 | ) |  | $ | 339.9 |
Assets by Segment |
| March 31 |  | December 31
| 2018 |  | 2017
| (in millions of dollars)
Assets |  |  |
Unum US | $ | 18,036.3 |  |  | $ | 18,109.1 |
Unum UK | 3,497.6 |  |  | 3,428.1 |
Colonial Life | 4,292.9 |  |  | 4,184.1 |
Closed Block | 34,603.8 |  |  | 35,051.2 |
Corporate | 2,581.7 |  |  | 3,240.6 |
Total Assets | $ | 63,012.3 |  |  | $ | 64,013.1 |
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 March 31
| 2018 |  | 2017
| (in millions of dollars)
Total Revenue | $ | 2,899.6 |  |  | $ | 2,806.5 |
Excluding: |  |  |
Net Realized Investment Gain (Loss) | (2.2 | ) |  | 11.0 |
Adjusted Operating Revenue | $ | 2,901.8 |  |  | $ | 2,795.5 |
Income Before Income Tax | $ | 341.1 |  |  | $ | 330.3 |
Excluding: |  |  |
Net Realized Investment Gain (Loss) | (2.2 | ) |  | 11.0 |
Loss from Guaranty Fund Assessment | — |  |  | (20.6 | )
Adjusted Operating Income | $ | 343.3 |  |  | $ | 339.9 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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