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Subsequent Event Subsequent Event	9 Months Ended
Subsequent Event Subsequent Event	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 4, 2019, we entered into a definitive agreement to acquire Batchelor & Kimball, Inc. (“BKI”) in an all-cash transaction. BKI is a leading full service provider of mechanical construction and maintenance services in the South and Southeast regions of the United States, and its results will be included within our United States mechanical construction and facilities services segment. The transaction is expected to close by the end of 2019, subject to customary closing conditions and regulatory approvals.