GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019
Goodwill [Roll Forward]
Beginning Balance		$ 3,222.2
Valuation adjustments from prior year acquisitions		(3.6)
Impairment during the period	$ 0.0	(20.9)
Divestiture of business		(6.2)
Changes due to foreign currency fluctuations		3.6
Ending Balance	3,195.1	3,195.1
Domestic And Canada Regulated Waste And Compliance Services
Goodwill [Roll Forward]
Beginning Balance		2,848.4
Valuation adjustments from prior year acquisitions		(3.6)
Changes due to foreign currency fluctuations		5.1
Ending Balance	2,849.9	2,849.9
International Regulated Waste And Compliance Services
Goodwill [Roll Forward]
Beginning Balance		373.8
Impairment during the period		(20.9)
Divestiture of business		(6.2)
Changes due to foreign currency fluctuations		(1.5)
Ending Balance	$ 345.2	$ 345.2

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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