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Business acquisitions (Policies)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Purchase price allocation	The allocation of the purchase price and the fair value of the previous equity investment to all of the assets acquired and liabilities assumed is based on the estimated fair values at the date of acquisition.

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- Definition

Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 05

-Paragraph 4

-Subparagraph (a)-(d)

-URI http://asc.fasb.org/extlink&oid=6909625&loc=d3e227-128457

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