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Business Disposition - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jan. 26, 2018
WCS | Contran Credit Facility | Contran | Amounts Acquired in Business Divestiture
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Acquired trade receivable					$ 36.3
Waste Management
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Pre-tax gain from disposal of discontinued operations				$ 58.4
Gain from disposal of discontinued operations, net of tax	$ 0.4			$ 38.6
Impairment of long lived assets held for use			$ 170.6
Waste Management | Contran Credit Facility
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncash borrowings					$ 36.3
Waste Management | Discontinued Operations
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Pre-tax gain from disposal of discontinued operations		$ 58.0
Gain from disposal of discontinued operations, net of tax		$ 38.6
Gain on disposal of discontinued operations, per diluted share, net of tax		$ 0.11

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