Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Amortized Cost of Fixed Maturity Securities	$ 4,496.0	$ 4,341.7
Equity Securities at Cost	509.8	561.5
Fair Value of Notes Payable	$ 792.7	$ 804.4
Common Stock, Par Value	$ 0.1	$ 0.1
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares Issued	51,318,171	52,418,246
Common Stock, Shares, Outstanding	51,318,171	52,418,246