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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
2011 Acquisitions [Member]
Dec. 31, 2012
2011 Acquisitions [Member]
Business Acquisition [Line Items]      
Business Acquisition, Cost of Acquired Entity, Cash Paid   $ 0.2  
Non-Contingent payable   0.7  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles 2.1    
Business Acquisition, Contingent Consideration, Potential Cash Payment   $ 1.0 $ 1.0