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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes (Textual)      
Unrecognized tax benefits $ 0.2    
Liability for uncertain tax positions, current 2.2    
Cash payments for income taxes $ 26.5 $ 47.4 $ 67.0