Consolidated Balance Sheets Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Amortized Cost of Fixed Maturity Securities	$ 4,560.7	$ 4,341.7
Equity Securities at Cost	486.9	561.5
Fair Value of Notes Payable	$ 781.3	$ 804.4
Common Stock, Par Value	$ 0.1	$ 0.1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares Issued	51,326,751	52,418,246
Common Stock, Shares Outstanding	51,326,751	52,418,246