Acquisitions (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Apr. 30, 2014	Apr. 01, 2013	Apr. 02, 2012	Apr. 01, 2014
Acquisitions [Line Items]
Charge for fair value write-up of acquired inventory sold	$ 48,586,000	$ 0	$ 0
Goodwill	340,743,000	12,274,000	2,209,000
Payments to Acquire Businesses, Net of Cash Acquired	809,390,000	13,358,000	2,961,000
Contingent consideration obligation	0	1,282,000
Contingent consideration fair value adjustment	(1,282,000)	(1,813,000)	0
Long-term Debt	766,796,000				820,000,000
ATMI [Member]
Acquisitions [Line Items]
Inventory					115,507,000
Identifiable intangible assets					297,040,000
Sale of Stock, Price Per Share					$ 34
Inventory fair value step-up					48,600,000
Charge for fair value write-up of acquired inventory sold	48,600,000
Property, Plant, and Equipment					126,302,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 3 months
Goodwill					332,124,000
Payments to Acquire Businesses, Gross	1,130,484,000
Direct costs associated with the transaction	13,300,000
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		361,000,000
Total purchase price, net of cash acquired					809,390,000
Pre-combination payment of unvested portion of awards	21,300,000
Jetalon [Member]
Acquisitions [Line Items]
Identifiable intangible assets						5,634,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Goodwill						10,090,000
Payments to Acquire Businesses, Net of Cash Acquired		13,358,000
Contingent Consideration Arrangements, Range of Outcomes, Value, High						14,500,000
Contingent consideration obligation						3,094,000
Total purchase price, net of cash acquired						16,452,000
Contingent consideration fair value adjustment		(1,800,000)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset	(1,300,000)
EPT [Member]
Acquisitions [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain				1,300,000
Foreign currency transaction gain realized upon acquisition.				200,000
Goodwill							2,200,000
Business Acquisition, Percentage of Voting Interests Acquired							50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value				2,900,000
Equity Method Investment, Ownership Percentage			50.00%
Business Combination, Consideration Transferred				3,400,000
Customer Relationships | ATMI [Member]
Acquisitions [Line Items]
Finite-lived Intangible Assets Acquired	165,100,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Trademarks and Trade names | ATMI [Member]
Acquisitions [Line Items]
Finite-lived Intangible Assets Acquired	120,800,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Other Intangible Assets | ATMI [Member]
Acquisitions [Line Items]
Finite-lived Intangible Assets Acquired	11,100,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years 5 months
Noncompete Agreements [Member]
Acquisitions [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 7 months
Noncompete Agreements [Member] | ATMI [Member]
Acquisitions [Line Items]
Finite-lived Intangible Assets Acquired	7,500,000
Senior secured term loan [Member]
Acquisitions [Line Items]
Long-term Debt	406,796,000
Senior secured term loan [Member] | ATMI [Member]
Acquisitions [Line Items]
Long-term Debt					460,000,000
Senior unsecured notes [Member]
Acquisitions [Line Items]
Long-term Debt	360,000,000
Senior unsecured notes [Member] | ATMI [Member]
Acquisitions [Line Items]
Long-term Debt								$ 360,000,000