Investments (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Investments (Textuals)      
Realized (losses) gains from sale of securities   $ 0.1  
Proceeds from sale of available-for-sale securities 0 0.3  
Cash surrender value of insurance contracts $ 72.7   $ 73.8