GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 3,222.2
Goodwill acquired during period	0.3
Purchase accounting adjustments	(2.1)
Impairment during the period	(20.9)
Divestiture of business	(6.2)
Changes due to foreign currency fluctuations	4.2
Ending Balance	3,197.5
Domestic and Canada RCS
Goodwill [Roll Forward]
Beginning Balance	2,848.4
Goodwill acquired during period	0.3
Purchase accounting adjustments	(2.1)
Changes due to foreign currency fluctuations	2.6
Ending Balance	2,849.2
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	1.6
Ending Balance	$ 348.3

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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