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Subsequent Event Subsequent Event	12 Months Ended
Subsequent Event Subsequent Event	Dec. 31, 2019
Subsequent Event [Abstract]
Subsequent Event	SUBSEQUENT EVENTS In January 2020, we acquired a company for an immaterial amount. This company provides mobile mechanical services within the Northeastern 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 amount 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. On February 15, 2020, we became aware of an infiltration and encryption of portions of our information technology network. This attack disrupted our operations that utilize the impacted portions of the network. We continue to assess the magnitude of the consequences and we are actively seeking to mitigate the effects. As of the date of this filing, we continue our efforts to restore the portions of such systems that remain impacted. We are unable to predict when the entire network will be functional. We are additionally unable to estimate precisely the total costs which will result from the attack and the remediation efforts. We maintain insurance coverage for these types of incidents, however, such policies may not completely provide coverage for, or offset the costs of, this infiltration.