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Subsequent Event	12 Months Ended
	Dec. 31, 2018
Subsequent Event
Subsequent Event	22.  Subsequent Event On January 31, 2019, we received Hart Scott Rodino antitrust clearance to proceed with the acquisition of landfill assets in West Texas related to our Solid Waste business. This transaction is expected to close in March 2019.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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