PARENTHETICAL DATA TO THE CONSOLIDATED BALANCE SHEET (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturities, available for sale, amortized cost	$ 22,097.2	$ 21,626.8
Equity securities cost	$ 252.7	$ 167.1
Shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	8,000,000,000	8,000,000,000
Common stock, shares issued	222,007,214	221,502,371
Common stock, shares outstanding	222,007,214	221,502,371