REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of Revenues Disaggregated by Service, Primary Geographical Regions and Timing of Revenue Recognition (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 690.3	$ 648.9	$ 2,034.4	$ 1,989.6
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	447.8	461.7	1,348.9	1,398.3
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	242.5	187.2	685.5	591.3
North America
Disaggregation of Revenue [Line Items]
Revenues	584.8	523.9	1,697.2	1,600.2
North America | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	369.7	365.4	1,097.5	1,094.4
North America | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	215.1	158.5	599.7	505.8
International
Disaggregation of Revenue [Line Items]
Revenues	105.5	125.0	337.2	389.4
International | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	78.1	96.3	251.4	303.9
International | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	$ 27.4	$ 28.7	$ 85.8	$ 85.5