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, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 684.3	$ 664.2
North America
Disaggregation of Revenue [Line Items]
Revenues	573.4	543.7
International
Disaggregation of Revenue [Line Items]
Revenues	110.9	120.5
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	451.3	452.6
Regulated Waste and Compliance Services | North America
Disaggregation of Revenue [Line Items]
Revenues	368.7	362.1
Regulated Waste and Compliance Services | International
Disaggregation of Revenue [Line Items]
Revenues	82.6	90.5
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	233.0	211.6
Secure Information Destruction Services | North America
Disaggregation of Revenue [Line Items]
Revenues	204.7	181.6
Secure Information Destruction Services | International
Disaggregation of Revenue [Line Items]
Revenues	$ 28.3	$ 30.0