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, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 664.9	$ 684.3
North America
Disaggregation of Revenue [Line Items]
Revenues	569.2	573.4
International
Disaggregation of Revenue [Line Items]
Revenues	95.7	110.9
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	447.8	451.3
Regulated Waste and Compliance Services | North America
Disaggregation of Revenue [Line Items]
Revenues	376.5	368.7
Regulated Waste and Compliance Services | International
Disaggregation of Revenue [Line Items]
Revenues	71.3	82.6
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	217.1	233.0
Secure Information Destruction Services | North America
Disaggregation of Revenue [Line Items]
Revenues	192.7	204.7
Secure Information Destruction Services | International
Disaggregation of Revenue [Line Items]
Revenues	$ 24.4	$ 28.3