Acquisitions Of Businesses	6 Months Ended
Jun. 30, 2018
Business Combinations [Abstract]
Acquisitions Of Businesses	Acquisitions of Businesses During the second quarter of 2018, we acquired two companies, each for an immaterial amount. One company provides mobile mechanical services within the Western region of the United States, and the other company provides mobile mechanical services and fire protection services within the Southern region of the United States. Both of their results have been included in our United States building services segment. On January 4, 2017, March 1, 2017 and November 1, 2017, we acquired three companies for a total consideration of $109.3 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 $9.6 million and other net assets of $2.3 million and have preliminarily ascribed $40.8 million to goodwill and $56.6 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 businesses acquired in 2018 and the business acquired in November of 2017 are still preliminary and subject to change during their respective measurement periods. The purchase price allocations for the businesses acquired in January and March of 2017 were finalized during the first quarter of 2018 with an insignificant impact. The acquisition of each business was accounted for by the acquisition method, and the prices paid for them have been allocated to their respective assets and liabilities, based upon the estimated fair value of their assets and liabilities at the dates of their respective acquisitions by us.

Acquisitions of Businesses

During the second quarter of 2018, we acquired two companies, each for an immaterial amount. One company provides mobile mechanical services within the Western region of the United States, and the other company provides mobile mechanical services and fire protection services within the Southern region of the United States. Both of their results have been included in our United States building services segment.

On January 4, 2017, March 1, 2017 and November 1, 2017, we acquired three companies for a total consideration of $109.3 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 $9.6 million and other net assets of $2.3 million and have preliminarily ascribed $40.8 million to goodwill and $56.6 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 businesses acquired in 2018 and the business acquired in November of 2017 are still preliminary and subject to change during their respective measurement periods. The purchase price allocations for the businesses acquired in January and March of 2017 were finalized during the first quarter of 2018 with an insignificant impact. The acquisition of each business was accounted for by the acquisition method, and the prices paid for them have been allocated to their respective assets and liabilities, based upon the estimated fair value of their assets and liabilities at the dates of their respective acquisitions by us.