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Subsequent Event Subsequent Event	12 Months Ended
Subsequent Event Subsequent Event	Dec. 31, 2018
Subsequent Event [Abstract]
Subsequent Event	SUBSEQUENT EVENT 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 will be included in our United States building services segment. The acquisition of this business will be accounted for by the acquisition method, and the price paid will be allocated to its respective assets and liabilities, based upon the estimated fair value of such assets and liabilities at the date of acquisition by us.