SEGMENT REPORTING - Summary of Revenues Details by Service Line (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	$ 883.3		$ 1,778.3
Revenues		$ 917.7		$ 1,810.1
Regulated Waste And Compliance Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	483.8		981.2
Revenues		512.2		1,023.4
Secure Information Destruction Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	230.0		449.9
Revenues		212.4		416.5
Communication And Related Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	81.3		173.2
Revenues		102.9		196.4
Manufacturing and Industrial Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	$ 88.2		$ 174.0
Revenues		$ 90.2		$ 173.8