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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