SEGMENT REPORTING - Summary of Revenues Details by Service Line (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	$ 854.9	$ 882.8	$ 2,633.2	$ 2,692.9
Regulated Waste And Compliance Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	476.6	502.5	1,457.8	1,525.9
Secure Information Destruction Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	227.6	204.7	677.5	621.2
Manufacturing and Industrial Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	79.1	86.6	253.1	260.4
Communication And Related Services
Entity Wide Information Revenue From External Customer [Line Items]
Revenues	$ 71.6	$ 89.0	$ 244.8	$ 285.4