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v3.23.1

Premium Income by Major Line of Business within Each Segment (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information |  |
Premium Income | $ 2,459.3 | $ 2,401.4
Operating Segments |  |
Segment Reporting Information |  |
Premium Income | 2,459.3 | 2,401.4
Operating Segments | Unum US |  |
Segment Reporting Information |  |
Premium Income | 1,609.6 | 1,543.0
Operating Segments | Unum US | Group Long-term Disability |  |
Segment Reporting Information |  |
Premium Income | 504.7 | 463.9
Operating Segments | Unum US | Group Short-term Disability |  |
Segment Reporting Information |  |
Premium Income | 240.3 | 221.6
Operating Segments | Unum US | Group Life |  |
Segment Reporting Information |  |
Premium Income | 413.1 | 412.6
Operating Segments | Unum US | Accidental Death & Dismemberment |  |
Segment Reporting Information |  |
Premium Income | 43.5 | 42.1
Operating Segments | Unum US | Voluntary Benefits |  |
Segment Reporting Information |  |
Premium Income | 214.5 | 218.6
Operating Segments | Unum US | Individual Disability |  |
Segment Reporting Information |  |
Premium Income | 124.2 | 113.6
Operating Segments | Unum US | Dental and Vision |  |
Segment Reporting Information |  |
Premium Income | 69.3 | 70.6
Operating Segments | Unum International |  |
Segment Reporting Information |  |
Premium Income | 188.6 | 187.8
Operating Segments | Unum International | Group Long-term Disability |  |
Segment Reporting Information |  |
Premium Income | 91.7 | 103.4
Operating Segments | Unum International | Group Life |  |
Segment Reporting Information |  |
Premium Income | 39.2 | 32.2
Operating Segments | Unum International | Supplemental |  |
Segment Reporting Information |  |
Premium Income | 31.8 | 29.0
Operating Segments | Unum International | Unum Poland |  |
Segment Reporting Information |  |
Premium Income | 25.9 | 23.2
Operating Segments | Colonial Life |  |
Segment Reporting Information |  |
Premium Income | 429.5 | 430.7
Operating Segments | Colonial Life | Accident, Sickness, and Disability |  |
Segment Reporting Information |  |
Premium Income | 235.7 | 239.7
Operating Segments | Colonial Life | Life |  |
Segment Reporting Information |  |
Premium Income | 105.3 | 101.7
Operating Segments | Colonial Life | Cancer and Critical Illness Colonial |  |
Segment Reporting Information |  |
Premium Income | 88.5 | 89.3
Operating Segments | Closed Block |  |
Segment Reporting Information |  |
Premium Income | 231.6 | 239.9
Operating Segments | Closed Block | Long-term Care |  |
Segment Reporting Information |  |
Premium Income | 175.1 | 174.8
Operating Segments | Closed Block | Other Insurance Product Line |  |
Segment Reporting Information |  |
Premium Income | $ 56.5 | $ 65.1

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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/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 + Details
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