REVENUES FROM CONTRACTS WITH CUSTOMERS - Schedule of Revenues Disaggregated by Service, Primary Geographical Regions and Timing of Revenue Recognition (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 2,659.3	$ 2,704.7	$ 2,646.9
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	1,775.8	1,798.2	1,854.0
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	883.5	906.5	792.9
North America
Disaggregation of Revenue [Line Items]
Revenues			2,136.5
North America | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	1,474.4	1,468.8	1,457.5
North America | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	781.4	794.3	679.0
International
Disaggregation of Revenue [Line Items]
Revenues			510.4
International | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	301.4	329.4	396.5
International | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	$ 102.1	$ 112.2	$ 113.9