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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 18, 2012
Acquisitions [Abstract]
Cash purchase price for company acquired		$ 270
Percentage of outstanding stock of Elco Filtration and Testing, Inc. acquired (in hundredths)	100.00%
Total purchase price of outstanding stock of Elco Filtration and Testing, Inc. acquired	61.5
Business combination, reason for business combination	Elco was purchased to strengthen the Company's wellhead product and service offerings and has been included in the DPS segment since the date of acquisition.
Preliminary goodwill	$ 30.7

This element represents a description of the primary reason for the business combination which may consist of general categories such as top-line growth, synergistic benefits, market share, and diversification and the more detailed factors that might apply.

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