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
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 664.2	$ 668.0
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	452.6	473.6
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	211.6	194.4
North America
Disaggregation of Revenue [Line Items]
Revenues	543.7	533.7
North America | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	362.1	366.8
North America | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	181.6	166.9
International
Disaggregation of Revenue [Line Items]
Revenues	120.5	134.3
International | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	90.5	106.8
International | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	$ 30.0	$ 27.5