Acquisitions (Narrative) (Details) (USD $)				0 Months Ended	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Aug. 02, 2011 VAC [Member]	Dec. 22, 2011 Rahu Catalytics Limited [Member]	Jun. 30, 2012 Rahu Catalytics Limited [Member]
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	86,513,000	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				20,000,000	25,200,000
Estimated fair value of contingent consideration				11,500,000
Change in estimated fair value of the liability for contingent consideration					11,800,000
Business acquisition, value of intangible assets			307,500,000	27,200,000
Business acquisition, deferred income tax asset (liability)				(6,900,000)
Business acquisition, value of goodwill				$ 30,300,000