GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 3,222.2
Valuation adjustments from prior year acquisitions	(3.6)
Impairment during the period	(20.9)
Divestiture and held-for-sale adjustments (Note 3)	(8.6)
Changes due to foreign currency fluctuations	(10.7)
Ending Balance	3,178.4
Domestic And Canada Regulated Waste And Compliance Services
Goodwill [Roll Forward]
Beginning Balance	2,848.4
Valuation adjustments from prior year acquisitions	(3.6)
Divestiture and held-for-sale adjustments (Note 3)	(2.4)
Changes due to foreign currency fluctuations	3.7
Ending Balance	2,846.1
International Regulated Waste And Compliance Services
Goodwill [Roll Forward]
Beginning Balance	373.8
Impairment during the period	(20.9)
Divestiture and held-for-sale adjustments (Note 3)	(6.2)
Changes due to foreign currency fluctuations	(14.4)
Ending Balance	$ 332.3

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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