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Closed Block (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Closed Block liabilities        
Closed Block liabilities: Future policy benefits and claims $ 4,829.6 $ 5,003.1    
Closed Block liabilities: Other policyholder funds 20.6 21.7    
Closed Block liabilities: Policyholder dividends payable 283.2 294.2    
Closed Block liabilities: Policyholder dividend obligation 3.1 0    
Closed Block liabilities: Other liabilities 35.9 79.2    
Total Closed Block liabilities 5,172.4 5,398.2    
Assets designated to the Closed Block        
Closed Block assets: Fixed maturities, available-for-sale 2,744.7 2,833.7    
Closed Block assets: Fixed maturities, trading 23.2 29.5    
Closed Block assets: Equity securities, available-for-sale 6.1 11.2    
Closed Block assets: Mortgage loans 691.0 677.9    
Closed Block assets: Policy loans 697.7 725.4    
Closed Block assets: Other investments 172.5 163.5    
Closed Block assets: Total investments 4,335.2 4,441.2    
Closed Block assets: Cash and cash equivalents 3.0      
Closed Block assets: Accrued investment income 59.6 64.3    
Closed Block assets: Premiums due and other receivables 13.8 17.9    
Closed Block assets: Deferred income tax asset 42.0 60.2    
Total assets designated to the Closed Block 4,453.6 4,583.6    
Excess of Closed Block liabilities over assets designated to the Closed Block 718.8 814.6    
Amounts included in accumulated other comprehensive income (loss) 68.2 33.0    
Maximum future earnings to be recognized from Closed Block assets and liabilities $ 787.0 $ 847.6 $ 913.5 $ 967.7