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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]        
Exclusion of stock issued in connection with acquisitions $ 4.0us-gaap_StockIssued1 $ 3.6us-gaap_StockIssued1 $ 0.9us-gaap_StockIssued1  
Outstanding checks excluded from purchases of business       $ 36.7dxpe_OutstandingChecksExcludedFromPurchasesOfBusiness