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Subsequent Event Subsequent Event	12 Months Ended
	Dec. 31, 2016
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event In January 2017, we acquired a company for an immaterial amount. This company provides fire protection and alarm services primarily in the Southern region of the United States and will be included in our United States mechanical construction and facilities services segment. The purchase price for the acquisition of this business is subject to finalization based on certain contingencies provided for in the purchase agreement. 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 its assets and liabilities at the date of acquisition by us.

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Subsequent Event [Abstract]

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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