Acquisitions (Details) (ChemGen Corporation [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
Feb. 17, 2012
ChemGen Corporation [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price, Total	$ 206.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	151.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 55.4

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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-Name Accounting Standards Codification

-Topic 805

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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