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Schedule III Supplementary Insurance Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Deferred Acquisition Costs | $ 2,300.9 |  | $ 2,521.1 |  |  |
Reserves for Future Policy Contract Benefits | 43,051.9 |  | 39,715.0 |  |  |
Unearned Premiums | 433.2 |  | 436.7 |  |  |
Policy and Contract Benefits | 1,494.0 |  | 1,565.0 |  |  |
Premium Income | 7,514.2 |  | 7,431.4 |  | 7,475.5 |
Net Investment Income | 2,519.6 | [1] | 2,495.5 | [1] | 2,346.6 | [1]
Benefits and Change in Reserves for Future Benefits | 7,209.5 |  | 6,354.1 |  | 6,291.6 |
Amortization of Deferred Acquisition Costs | 533.8 |  | 547.1 |  | 526.2 |
All Other Expenses | 2,277.5 | [2] | 1,960.7 | [2] | 1,980.9 | [2]
Unum U.S. |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Deferred Acquisition Costs | 1,392.3 |  | 1,362.2 |  |  |
Reserves for Future Policy Contract Benefits | 12,280.2 |  | 11,799.2 |  |  |
Unearned Premiums | 43.4 |  | 39.6 |  |  |
Policy and Contract Benefits | 889.2 |  | 910.8 |  |  |
Premium Income | 4,296.0 |  | 4,255.4 |  | 4,278.4 |
Net Investment Income | 951.4 | [1] | 941.5 | [1] | 934.3 | [1]
Benefits and Change in Reserves for Future Benefits | 3,113.5 |  | 3,124.4 |  | 3,192.1 |
Amortization of Deferred Acquisition Costs | 298.7 |  | 307.9 |  | 293.8 |
All Other Expenses | 1,137.0 | [2] | 1,118.3 | [2] | 1,128.0 | [2]
Premiums Written | 2,965.8 | [3] | 2,938.9 | [3] | 2,997.0 | [3]
Unum U.K. |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Deferred Acquisition Costs | 59.4 |  | 58.2 |  |  |
Reserves for Future Policy Contract Benefits | 2,172.5 |  | 2,053.9 |  |  |
Unearned Premiums | 143.2 |  | 141.2 |  |  |
Policy and Contract Benefits | 135.6 |  | 141.6 |  |  |
Premium Income | 687.6 |  | 650.6 |  | 686.1 |
Net Investment Income | 189.9 | [1] | 170.5 | [1] | 124.5 | [1]
Benefits and Change in Reserves for Future Benefits | 493.8 |  | 435.8 |  | 373.6 |
Amortization of Deferred Acquisition Costs | 29.2 |  | 27.0 |  | 30.5 |
All Other Expenses | 162.8 | [2] | 150.7 | [2] | 159.3 | [2]
Premiums Written | 480.0 | [3] | 469.4 | [3] | 508.6 | [3]
Colonial Life |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Deferred Acquisition Costs | 849.2 |  | 805.0 |  |  |
Reserves for Future Policy Contract Benefits | 1,598.1 |  | 1,507.2 |  |  |
Unearned Premiums | 28.5 |  | 26.8 |  |  |
Policy and Contract Benefits | 134.7 |  | 118.4 |  |  |
Premium Income | 1,135.3 |  | 1,075.7 |  | 1,015.1 |
Net Investment Income | 132.4 | [1] | 122.5 | [1] | 114.3 | [1]
Benefits and Change in Reserves for Future Benefits | 589.4 |  | 534.7 |  | 480.6 |
Amortization of Deferred Acquisition Costs | 189.0 |  | 187.2 |  | 178.5 |
All Other Expenses | 207.7 | [2] | 194.8 | [2] | 189.9 | [2]
Premiums Written | 944.9 | [3] | 901.9 | [3] | 851.5 | [3]
Closed Block |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Deferred Acquisition Costs | 0 |  | 295.7 |  |  |
Reserves for Future Policy Contract Benefits | 27,001.1 |  | 24,354.7 |  |  |
Unearned Premiums | 218.1 |  | 229.1 |  |  |
Policy and Contract Benefits | 334.5 |  | 394.2 |  |  |
Premium Income | 1,395.3 |  | 1,449.7 |  | 1,495.9 |
Net Investment Income | 1,189.7 | [1] | 1,166.4 | [1] | 1,106.8 | [1]
Benefits and Change in Reserves for Future Benefits | 3,012.8 | [4] | 2,259.2 |  | 2,245.3 |
Amortization of Deferred Acquisition Costs | 16.9 |  | 25.0 |  | 23.4 |
All Other Expenses | 582.9 | [2] | 327.9 | [2] | 340.7 | [2]
Premiums Written | 1,385.1 | [3] | 1,430.4 | [3] | 1,484.0 | [3]
Corporate |  |  |  |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |  |  |  |
Premium Income | 0 |  | 0 |  | 0 |
Net Investment Income | 56.2 | [1] | 94.6 | [1] | 66.7 | [1]
Benefits and Change in Reserves for Future Benefits | 0 |  | 0 |  | 0 |
Amortization of Deferred Acquisition Costs | 0 |  | 0 |  | 0 |
All Other Expenses | 187.1 | [2] | 169.0 | [2] | 163.0 | [2]
Premiums Written | $ 0 | [3] | $ 0 | [3] | $ 0 | [3]
[1] | Net investment income is allocated based upon segmentation. Each segment has its own specifically identified assets and receives the investment income generated by those assets.
[2] | Includes commissions, interest and debt expense, deferral of acquisition costs, compensation expense, and other expenses. Also included in 2011 in the Closed Block segment is an impairment charge of $289.8 million related to long-term care deferred policy acquisition costs. Where not directly attributable to a segment, expenses are generally allocated based on activity levels, time information, and usage statistics.
[3] | Excludes life insurance.
[4] | Included in 2011 in the Closed Block segment is a reserve charge of $573.6 million related to our long-term care business and a reserve charge of $183.5 million related to our individual disability business.

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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