Unsolicited Takeover Attempt	12 Months Ended
Mar. 31, 2013
Unsolicited Takeover Attempt, Description [Abstract]
Unsolicited Takeover Attempt	UNSOLICITED TAKEOVER ATTEMPT On February 11, 2010, Air Products initiated an unsolicited tender offer for all of the Company’s outstanding shares of common stock. In connection with this unsolicited tender offer, Air Products filed an action against the Company and members of its Board in the Delaware Court of Chancery. On February 15, 2011, the Delaware Court of Chancery denied in their entirety all requests for relief by Air Products and dismissed with prejudice all claims asserted against the Company and its directors. Air Products promptly terminated its unsolicited tender offer and no appeal of the Court’s decision was filed. In connection with the unsolicited tender offer and related litigation, the Company incurred on a cumulative basis a net $60.0 million of legal and professional fees and other costs. The Company incurred unsolicited takeover attempt costs of $44.4 million during the year ended March 31, 2011 and recognized benefits of $7.9 million from lower than previously estimated net costs related to the unsolicited takeover attempt during the year ended March 31, 2012. The Company’s results were not impacted by the unsolicited takeover attempt during the year ended March 31, 2013.

UNSOLICITED TAKEOVER ATTEMPT

On February 11, 2010, Air Products initiated an unsolicited tender offer for all of the Company’s outstanding shares of common stock. In connection with this unsolicited tender offer, Air Products filed an action against the Company and members of its Board in the Delaware Court of Chancery. On February 15, 2011, the Delaware Court of Chancery denied in their entirety all requests for relief by Air Products and dismissed with prejudice all claims asserted against the Company and its directors. Air Products promptly terminated its unsolicited tender offer and no appeal of the Court’s decision was filed. In connection with the unsolicited tender offer and related litigation, the Company incurred on a cumulative basis a net $60.0 million of legal and professional fees and other costs. The Company incurred unsolicited takeover attempt costs of $44.4 million during the year ended March 31, 2011 and recognized benefits of $7.9 million from lower than previously estimated net costs related to the unsolicited takeover attempt during the year ended March 31, 2012. The Company’s results were not impacted by the unsolicited takeover attempt during the year ended March 31, 2013.