GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance	$ 3,604.0	$ 3,591.0
Goodwill acquired during year	31.6	46.5
Purchase accounting adjustments	(7.3)	(7.4)
Impairments during the year		(65.0)
Write-offs related to disposition and assets held for sale	(5.9)	(7.1)
Changes due to foreign currency fluctuations	(24.0)	46.0
Ending Balance	3,598.4	3,604.0
Domestic and Canada RCS
Goodwill [Roll Forward]
Beginning Balance	2,850.2	2,811.8
Goodwill acquired during year	31.6	36.9
Purchase accounting adjustments	(6.4)	(10.1)
Impairments during the year		0.0
Write-offs related to disposition and assets held for sale	(5.8)	0.0
Changes due to foreign currency fluctuations	(6.5)	11.6
Ending Balance	2,863.1	2,850.2
International Regulated Waste And Compliance Services
Goodwill [Roll Forward]
Beginning Balance	466.8	498.4
Goodwill acquired during year	0.0	4.9
Purchase accounting adjustments	0.0	1.2
Impairments during the year		(65.0)
Write-offs related to disposition and assets held for sale	(0.1)	(7.1)
Changes due to foreign currency fluctuations	(17.5)	34.4
Ending Balance	449.2	466.8
All Other
Goodwill [Roll Forward]
Beginning Balance	287.0	280.8
Goodwill acquired during year	0.0	4.7
Purchase accounting adjustments	(0.9)	1.5
Impairments during the year		0.0
Write-offs related to disposition and assets held for sale	0.0	0.0
Changes due to foreign currency fluctuations	0.0	0.0
Ending Balance	$ 286.1	$ 287.0

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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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