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Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net | $ 1,888.5 | $ 1,881.2 | $ 1,875.0 | $ 1,869.5 | $ 1,868.2 | $ 1,850.2 | $ 1,849.8 | $ 1,863.2 | $ 7,514.2 | $ 7,431.4 | $ 7,475.5
Unum U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 4,296.0 | 4,255.4 | 4,278.4
Unum U.S. | Group Long term Disability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 1,580.2 | 1,639.4 | 1,726.9
Unum U.S. | Group Short-term Disability |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 455.2 | 430.9 | 432.8
Unum U.S. | Group Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 1,106.7 | 1,090.3 | 1,057.7
Unum U.S. | Accidental Death & Dismemberment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 109.2 | 106.1 | 104.9
Unum U.S. | Individual Disability-Recently Issued |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 464.7 | 457.9 | 463.7
Unum U.S. | Voluntary Benefits |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 580.0 | 530.8 | 492.4
Unum U.K. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 687.6 | 650.6 | 686.1
Unum U.K. | Group Long term Disability UK |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 419.6 | 421.2 | 482.4
Unum U.K. | Group Life UK |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 203.6 | 171.6 | 147.8
Unum U.K. | Supplemental and Voluntary UK |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 64.4 | 57.8 | 55.9
Colonial Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 1,135.3 | 1,075.7 | 1,015.1
Colonial Life | Accident, Sickness, and Disability - Colonial |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 695.3 | 661.0 | 625.8
Colonial Life | Life Colonial |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 190.7 | 176.5 | 165.6
Colonial Life | Cancer and Critical Illness - Colonial |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 249.3 | 238.2 | 223.7
Closed Block |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 1,395.3 | 1,449.7 | 1,495.9
Closed Block | Individual Disability Closed Block |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 787.0 | 847.0 | 898.5
Closed Block | Long-term Care |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | 608.1 | 599.2 | 594.7
Closed Block | All Other Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  |  |  |  |  |  |  | $ 0.2 | $ 3.5 | $ 2.7

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- Definition Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + Details
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