Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Amortized Cost of Fixed Maturity Securities	$ 4,677.6	$ 4,560.7
Equity Securities at Cost	452.3	486.9
Fair Value of Notes Payable	$ 788.5	$ 781.3
Common Stock, Par Value	$ 0.1	$ 0.1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares Issued	51,184,531	51,326,751
Common Stock, Shares, Outstanding	51,184,531	51,326,751