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Stock Repurchase Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of stock repurchase activity      
Amount available for future purchases $ 70.0 $ 95.0 $ 80.0
Common Stock [Member]
     
Schedule of stock repurchase activity      
Number of shares repurchased 495,085 484,841 1,581,444
Average price paid per share $ 50.49 $ 51.56 $ 128.15
Amount available for future purchases $ 70.0 $ 95.0 $ 80.0