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Selected Operating Statement Data by 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] |  |  |  |  |  |  |  |  |  |  |
Premium Income | $ 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
Net Investment Income | 634.6 | 629.2 | 637.1 | 618.7 | 634.3 | 618.4 | 629.8 | 613.0 | 2,519.6 | 2,495.5 | 2,346.6
Other Income |  |  |  |  |  |  |  |  | 249.1 | 241.6 | 257.2
Operating Revenue |  |  |  |  |  |  |  |  | 10,282.9 | 10,168.5 | 10,079.3
Operating Income (Loss) |  |  |  |  |  |  |  |  | 262.1 | 1,306.6 | 1,280.6
Interest and Debt Expense |  |  |  |  |  |  |  |  | 143.3 | 141.8 | 125.4
Depreciation and Amortization |  |  |  |  |  |  |  |  | 623.1 | 631.9 | 610.3
Unum U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium Income |  |  |  |  |  |  |  |  | 4,296.0 | 4,255.4 | 4,278.4
Net Investment Income |  |  |  |  |  |  |  |  | 951.4 | 941.5 | 934.3
Other Income |  |  |  |  |  |  |  |  | 121.6 | 122.8 | 118.8
Operating Revenue |  |  |  |  |  |  |  |  | 5,369.0 | 5,319.7 | 5,331.5
Operating Income (Loss) |  |  |  |  |  |  |  |  | 819.8 | 769.1 | 717.6
Interest and Debt Expense |  |  |  |  |  |  |  |  | 1.0 | 1.2 | 2.0
Depreciation and Amortization |  |  |  |  |  |  |  |  | 356.5 | 360.9 | 344.7
Unum U.K. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium Income |  |  |  |  |  |  |  |  | 687.6 | 650.6 | 686.1
Net Investment Income |  |  |  |  |  |  |  |  | 189.9 | 170.5 | 124.5
Other Income |  |  |  |  |  |  |  |  | 0.3 | 1.2 | 2.4
Operating Revenue |  |  |  |  |  |  |  |  | 877.8 | 822.3 | 813.0
Operating Income (Loss) |  |  |  |  |  |  |  |  | 192.0 | 208.8 | 249.6
Interest and Debt Expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and Amortization |  |  |  |  |  |  |  |  | 40.7 | 38.2 | 42.4
Colonial Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium Income |  |  |  |  |  |  |  |  | 1,135.3 | 1,075.7 | 1,015.1
Net Investment Income |  |  |  |  |  |  |  |  | 132.4 | 122.5 | 114.3
Other Income |  |  |  |  |  |  |  |  | 0.5 | 0.7 | 0.5
Operating Revenue |  |  |  |  |  |  |  |  | 1,268.2 | 1,198.9 | 1,129.9
Operating Income (Loss) |  |  |  |  |  |  |  |  | 282.1 | 282.2 | 280.9
Interest and Debt Expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and Amortization |  |  |  |  |  |  |  |  | 202.4 | 200.1 | 192.0
Closed Block |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium Income |  |  |  |  |  |  |  |  | 1,395.3 | 1,449.7 | 1,495.9
Net Investment Income |  |  |  |  |  |  |  |  | 1,189.7 | 1,166.4 | 1,106.8
Other Income |  |  |  |  |  |  |  |  | 106.1 | 113.6 | 131.1
Operating Revenue |  |  |  |  |  |  |  |  | 2,691.1 | 2,729.7 | 2,733.8
Operating Income (Loss) |  |  |  |  |  |  |  |  | (921.5) | 117.6 | 124.4
Interest and Debt Expense |  |  |  |  |  |  |  |  | 10.5 | 11.7 | 16.6
Depreciation and Amortization |  |  |  |  |  |  |  |  | 22.7 | 31.6 | 29.6
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Investment Income |  |  |  |  |  |  |  |  | 56.2 | 94.6 | 66.7
Other Income |  |  |  |  |  |  |  |  | 20.6 | 3.3 | 4.4
Operating Revenue |  |  |  |  |  |  |  |  | 76.8 | 97.9 | 71.1
Operating Income (Loss) |  |  |  |  |  |  |  |  | (110.3) | (71.1) | (91.9)
Interest and Debt Expense |  |  |  |  |  |  |  |  | 131.8 | 128.9 | 106.8
Depreciation and Amortization |  |  |  |  |  |  |  |  | $ 0.8 | $ 1.1 | $ 1.6

X
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