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Unaudited Quarterly Results (Detail) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) | Dec. 31, 2011 GBP (£) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2011 Before Tax [Member] USD ($) | Dec. 31, 2011 After Tax [Member] USD ($) | Dec. 31, 2011 Long-term Care USD ($) | Dec. 31, 2011 Long-term Care Before Tax [Member] USD ($) | Dec. 31, 2011 Long-term Care After Tax [Member] USD ($) | Dec. 31, 2011 Individual Disability Closed Block Before Tax [Member] USD ($) | Dec. 31, 2011 Individual Disability Closed Block After Tax [Member] USD ($)
Impairment of Deferred Acquisition Costs |  |  | $ 289.8 | $ 0 | $ 0 | $ 289.8 | $ 188.4 |  |  |  |  |
Reserve Increase Due to Unlocking |  |  |  |  |  |  |  | 573.6 | 573.6 | 372.8 | 183.5 | 119.3
Income Tax Examination, Increase (Decrease) in Liability from Prior Year | (41.3) |  | (41.3) |  |  |  |  |  |  |  |  |
Income Tax Reconciliation, Repatriation of Foreign Earnings | 18.6 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Dividends Received |  | £ 150.0 |  |  |  |  |  |  |  |  |  |

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