CONSOLIDATED BALANCE SHEET (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investments:
Fixed maturities, available for sale, amortized cost	$ 19,803.1	$ 18,947.0
Equity securities cost	$ 580.7	$ 447.4
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	8,000,000,000	8,000,000,000
Common stock, shares issued (in shares)	173,753,614	184,028,511
Common stock, shares outstanding (in shares)	173,753,614	184,028,511