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Closed Block (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Closed Block liabilities        
Closed Block liabilities: Future policy benefits and claims $ 4,664.5 $ 4,829.6    
Closed Block liabilities: Other policyholder funds 10.7 11.2    
Closed Block liabilities: Policyholder dividends payable 280.6 292.6    
Closed Block liabilities: Policyholder dividend obligation 131.0 3.1    
Closed Block liabilities: Other liabilities 31.3 32.6    
Total Closed Block liabilities 5,118.1 5,169.1    
Assets designated to the Closed Block        
Closed Block assets: Fixed maturities, available-for-sale 2,735.1 2,744.7    
Closed Block assets: Fixed maturities, trading 17.0 23.2    
Closed Block assets: Equity securities, available-for-sale 5.5 6.1    
Closed Block assets: Mortgage loans 719.4 691.0    
Closed Block assets: Policy loans 665.5 697.7    
Closed Block assets: Other investments 158.0 172.5    
Closed Block assets: Total investments 4,300.5 4,335.2    
Closed Block assets: Cash and cash equivalents 51.3 3.0    
Closed Block assets: Accrued investment income 52.5 59.6    
Closed Block assets: Premiums due and other receivables 13.2 13.8    
Closed Block assets: Deferred income tax asset 39.2 38.7    
Total assets designated to the Closed Block 4,456.7 4,450.3    
Excess of Closed Block liabilities over assets designated to the Closed Block 661.4 718.8    
Amounts included in accumulated other comprehensive income (loss) 62.4 68.2    
Maximum future earnings to be recognized from Closed Block assets and liabilities $ 723.8 $ 787.0 $ 847.6 $ 913.5