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Acquisitions Of Businesses	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions Of Businesses	Acquisitions of Businesses      In January 2019, we acquired a company for an immaterial amount. This company provides mobile mechanical services within the Southern region of the United States, and its results have been included in our United States building services segment. During 2018, we acquired four companies for a total consideration of $71.6 million. Two companies provide mobile mechanical services, one within the Eastern region and the other within the Western region of the United States. The third company is a full service provider of mechanical services within the Southern region of the United States. The results of these three companies have been included in our United States building services segment. The fourth company provides electrical construction and maintenance services for industrial and commercial buildings in North Texas, and its results have been included in our United States electrical construction and facilities services segment. In connection with these acquisitions, we acquired working capital of $8.9 million and have preliminarily ascribed $26.1 million to goodwill and $36.6 million to identifiable intangible assets. We expect that all of the acquired goodwill will be deductible for tax purposes. The purchase price allocation for the business acquired in January 2019 and the businesses acquired in 2018 are preliminary and subject to change during their respective measurement periods. The acquisition of each business was accounted for by the acquisition method of accounting, and the prices paid for them have been allocated to their respective assets and liabilities, based upon the estimated fair value of such assets and liabilities at the dates of their respective acquisitions by us.

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- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-URI http://asc.fasb.org/topic&trid=2303972

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- References

No definition available.

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