Acquisitions (Details) (USD $)			1 Months Ended		0 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Jan. 31, 2011 AT Films [Member]	Feb. 29, 2012 AT Films [Member]	Mar. 11, 2011 Microfluidics [Member]	Jun. 10, 2011 CVI MG [Member]
Business Acquisition [Line Items]
Annual revenue of entity acquired			$ 9,000,000		$ 16,000,000	$ 178,000,000
Aggregate purchase price			34,500,000		18,500,000	394,700,000
Purchase price paid (in cash)			31,800,000			393,300,000
Purchase price funded through debt						1,400,000
Purchase price financed with borrowings under revolving credit facility						365,000,000
Contingent consideration value as of opening balance sheet date			2,700,000
Contingent consideration paid	1,500,000	3,000,000		1,500,000
Contingent consideration yet to be paid accounted as accrued liabilities	129,255,000	130,696,000	1,500,000	1,500,000
Goodwill recognized in acquisition			18,200,000		5,900,000	208,500,000
Intangible assets recognized in acquisition			11,400,000		9,700,000	115,800,000
Goodwill deductible for tax purpose			$ 18,200,000		$ 5,900,000	$ 117,700,000