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Deferred Acquisition Costs by Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Beginning of Year | $ 2,521.1 | $ 2,482.5 | $ 2,472.4
Capitalized | 628.3 | 607.7 | 593.6
Amortization | (533.8) | (547.1) | (526.2)
Impairment of Deferred Acquisition Costs | (289.8) | 0 | 0
Adjustment Related to Unrealized Investment Gains/Losses | (24.7) | (20.0) | (62.9)
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | (0.2) | (2.0) | 5.6
End of Year | 2,300.9 | 2,521.1 | 2,482.5
Unum U.S. |  |  |
Beginning of Year | 1,362.2 | 1,351.5 | 1,341.4
Capitalized | 333.8 | 323.2 | 321.6
Amortization | (298.7) | (307.9) | (293.8)
Impairment of Deferred Acquisition Costs | 0 |  |
Adjustment Related to Unrealized Investment Gains/Losses | (5.0) | (4.6) | (17.7)
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | 0 | 0 | 0
End of Year | 1,392.3 | 1,362.2 | 1,351.5
Unum U.K. |  |  |
Beginning of Year | 58.2 | 58.9 | 54.7
Capitalized | 30.6 | 28.3 | 29.1
Amortization | (29.2) | (27.0) | (30.5)
Impairment of Deferred Acquisition Costs | 0 |  |
Adjustment Related to Unrealized Investment Gains/Losses | 0 | 0 | 0
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | (0.2) | (2.0) | 5.6
End of Year | 59.4 | 58.2 | 58.9
Colonial Life |  |  |
Beginning of Year | 805.0 | 761.2 | 755.9
Capitalized | 252.9 | 246.4 | 229.0
Amortization | (189.0) | (187.2) | (178.5)
Impairment of Deferred Acquisition Costs | 0 |  |
Adjustment Related to Unrealized Investment Gains/Losses | (19.7) | (15.4) | (45.2)
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | 0 | 0 | 0
End of Year | 849.2 | 805.0 | 761.2
Closed Block |  |  |
Beginning of Year | 295.7 | 310.9 | 320.4
Capitalized | 11.0 | 9.8 | 13.9
Amortization | (16.9) | (25.0) | (23.4)
Impairment of Deferred Acquisition Costs | (289.8) |  |
Adjustment Related to Unrealized Investment Gains/Losses | 0 | 0 | 0
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | 0 | 0 | 0
End of Year | $ 0 | $ 295.7 | $ 310.9

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