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PARENTHETICAL DATA TO THE CONSOLIDATED BALANCE SHEET (USD $)
In Millions, except Share data
Sep. 30, 2011
Dec. 31, 2010
Investments:  
Fixed maturities, available for sale, amortized cost$ 21,347.7$ 20,155.8
Equity securities amortized cost$ 167.0$ 68.2
Shareholders' equity:  
Common stock, par value$ 0.01$ 0.01
Common stock, shares authorized8,000,000,0008,000,000,000
Common stock, shares issued243,247,260251,084,174
Common stock, shares outstanding243,247,260251,084,174