Acquisitions Of Businesses	12 Months Ended
Acquisitions Of Businesses	Dec. 31, 2019
Business Combinations [Abstract]
Acquisitions Of Businesses	ACQUISITIONS OF BUSINESSES Acquisitions are accounted for utilizing the acquisition method of accounting and the prices paid for them are allocated to their respective assets and liabilities based upon the estimated fair value of such assets and liabilities at the dates of their respective acquisition by us. On November 1, 2019, we completed the acquisition of Batchelor & Kimball, Inc. (“BKI”), a leading full service provider of mechanical construction and maintenance services. This acquisition strengthens our position and broadens our capabilities in the Southern and Southeastern regions of the United States, and its results of operations have been included within our United States mechanical construction and facilities services segment. Under the terms of the transaction, we acquired 100% of BKI’s outstanding capital stock for total consideration of approximately $220.0 million. In connection with the acquisition of BKI, we acquired working capital of $29.8 million and other net assets of $4.9 million and have preliminarily ascribed $43.6 million to goodwill and $141.7 million to identifiable intangible assets. Goodwill is calculated as the excess of the consideration transferred over the fair value of the net assets acquired and represents the future economic benefits expected from this strategic acquisition. The weighted average amortization period for the identifiable intangible assets, which consist of a trade name, customer relationships, and contract backlog, is approximately 10.5 years. In addition to BKI, during 2019, we completed six other acquisitions for total consideration of $85.3 million. Such companies include: (a) a company which provides electrical contracting services in central Iowa, the results of operations of which have been included within our United States electrical construction and facilities services segment, (b) a company which provides mechanical contracting services in south-central and eastern Texas, the results of operations of which have been included within our United States mechanical construction and facilities services segment, and (c) four companies within our United States building services segment which bolster our presence in geographies where we have existing operations and provide either mobile mechanical services or building automation and controls solutions. In connection with these acquisitions, we acquired working capital of $25.3 million and other net assets of $1.3 million and have preliminarily ascribed $29.1 million to goodwill and $29.6 million to identifiable intangible assets. During 2018, we acquired four companies for 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 $8.7 million and have ascribed $26.3 million to goodwill and $36.6 million to identifiable intangible assets. During 2017, we acquired three companies for total consideration of $111.9 million. One company provides fire protection and alarm services primarily in the Southern region of the United States. The second company provides millwright services for manufacturing companies throughout the United States. Both of their results have been included in our United States mechanical construction and facilities services segment. The third company provides mobile mechanical services within the Western region of the United States, and its results have been included in our United States building services segment. In connection with these acquisitions, we acquired working capital of $12.3 million and other net assets of $2.3 million and have ascribed $40.7 million to goodwill and $56.6 million to identifiable intangible assets. We expect that all of the goodwill acquired in connection with these acquisitions will be deductible for tax purposes. The purchase price allocations for the businesses acquired in 2019 are preliminary and subject to change during their respective measurement periods. The purchase price allocations for the businesses acquired in 2018 and 2017 have been finalized during their respective measurement periods with an insignificant impact.