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Stock Repurchase Program (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2013
Jan. 31, 2014
Jul. 31, 2012
Aug. 30, 2011
Class of Stock [Line Items]                
Stock Repurchased and Retired During Period, Shares 244,000 439,000 161,000 500,000 371,000      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           500,000 1,000,000 500,000
Stock Repurchased During Period, Value $ 5.6 $ 7.9 $ 3.6 $ 15.1 $ 7.8      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased         29,000      
Treasury Stock [Member]
                
Class of Stock [Line Items]                
Stock Repurchased and Retired During Period, Shares       500,000