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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Available-for-sale fixed maturity securities investments, current, amortized cost $ 17,735.2 $ 16,826.7
Available-for-sale equity securities investment, current, cost 1,268.5 1,168.5
Available-for-sale fixed maturity securities investments, long-term, amortized cost 504.8 455.9
Available-for-sale equity securities investments, long-term, cost $ 26.9 $ 27.4
Preferred stock, par value $ 0 $ 0
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 900,000,000 900,000,000
Common stock, shares issued 274,470,910 293,273,830
Common stock, shares outstanding 274,470,910 293,273,830