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Premium Income by Major Line of Business within Each Segment (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information |  |
Premium Income | $ 2,250.0 | $ 2,142.9
Operating Segments |  |
Segment Reporting Information |  |
Premium Income | 2,250.0 | 2,142.9
Operating Segments | Unum US |  |
Segment Reporting Information |  |
Premium Income | 1,438.8 | 1,360.4
Operating Segments | Unum US | Group Long term Disability |  |
Segment Reporting Information |  |
Premium Income | 441.2 | 434.4
Operating Segments | Unum US | Group Short term Disability |  |
Segment Reporting Information |  |
Premium Income | 176.3 | 157.9
Operating Segments | Unum US | Group Life |  |
Segment Reporting Information |  |
Premium Income | 399.2 | 367.8
Operating Segments | Unum US | Accidental Death Dismemberment |  |
Segment Reporting Information |  |
Premium Income | 38.7 | 36.6
Operating Segments | Unum US | Individual Disability |  |
Segment Reporting Information |  |
Premium Income | 104.9 | 107.0
Operating Segments | Unum US | Voluntary Benefits |  |
Segment Reporting Information |  |
Premium Income | 229.8 | 215.2
Operating Segments | Unum US | Dental and Vision |  |
Segment Reporting Information |  |
Premium Income | 48.7 | 41.5
Operating Segments | Unum UK |  |
Segment Reporting Information |  |
Premium Income | 139.6 | 121.3
Operating Segments | Unum UK | Group Long term Disability |  |
Segment Reporting Information |  |
Premium Income | 90.8 | 80.8
Operating Segments | Unum UK | Group Life |  |
Segment Reporting Information |  |
Premium Income | 28.6 | 24.8
Operating Segments | Unum UK | Supplemental Insurance |  |
Segment Reporting Information |  |
Premium Income | 20.2 | 15.7
Operating Segments | Colonial Life |  |
Segment Reporting Information |  |
Premium Income | 398.3 | 374.3
Operating Segments | Colonial Life | Accident, Sickness, and Disability Insurance |  |
Segment Reporting Information |  |
Premium Income | 231.3 | 219.1
Operating Segments | Colonial Life | Life Insurance Product Line |  |
Segment Reporting Information |  |
Premium Income | 81.0 | 74.2
Operating Segments | Colonial Life | Cancer and Critical Illness Colonial |  |
Segment Reporting Information |  |
Premium Income | 86.0 | 81.0
Operating Segments | Closed Block |  |
Segment Reporting Information |  |
Premium Income | 273.3 | 286.9
Operating Segments | Closed Block | Individual Disability Insurance |  |
Segment Reporting Information |  |
Premium Income | 109.4 | 121.3
Operating Segments | Closed Block | Long-term Care |  |
Segment Reporting Information |  |
Premium Income | 161.3 | 163.1
Operating Segments | Closed Block | Other Insurance Product Line |  |
Segment Reporting Information |  |
Premium Income | $ 2.6 | $ 2.5

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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