Acquisitions (Narrative) (Details)				3 Months Ended
	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Aug. 02, 2011 VAC [Member] USD ($)	Mar. 31, 2012 Rahu Catalytics Limited [Member] USD ($)	Dec. 22, 2011 Rahu Catalytics Limited [Member] USD ($)	Dec. 22, 2011 Rahu Catalytics Limited [Member] EUR (€)
Business Acquisition [Line Items]
Purchase price total cash consideration			$ 812,200,000
Cash consideration paid for business acquisition			686,200,000		39,100,000
Purchase price of VAC Holding payable to seller	86,525,000	86,513,000	86,300,000
Shares issued in connection with acquisition of VAC Holding			39,700,000
Contigent considertion amounts based on certain volume targets				26,700,000		20,000,000
Estimated fair value of contingent consideration					11,500,000
Change in estimated fair value of the liability for contingent consideration				12,100,000
Business acquisition, value of intangible assets			307,500,000		27,200,000
Business Acquisition, Purchase Price Allocation, Deferred Income Taxes, Asset (Liability), Net					(6,900,000)
Business acquisition, value of goodwill				$ 30,300,000