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Business Disposition - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Jun. 30, 2017	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	38.2
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	$ 38.2
Gain on disposal of discontinued operations, per diluted share, net of tax	$ 0.11