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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 661.6	$ 669.5	$ 1,326.5	$ 1,353.8
North America
Disaggregation of Revenue [Line Items]
Revenues	567.6	565.2	1,136.8	1,138.6
International
Disaggregation of Revenue [Line Items]
Revenues	94.0	104.3	189.7	215.2
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	442.5	444.7	890.3	896.0
Regulated Waste and Compliance Services | North America
Disaggregation of Revenue [Line Items]
Revenues	372.1	366.4	748.6	735.1
Regulated Waste and Compliance Services | International
Disaggregation of Revenue [Line Items]
Revenues	70.4	78.3	141.7	160.9
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	219.1	224.8	436.2	457.8
Secure Information Destruction Services | North America
Disaggregation of Revenue [Line Items]
Revenues	195.5	198.8	388.2	403.5
Secure Information Destruction Services | International
Disaggregation of Revenue [Line Items]
Revenues	$ 23.6	$ 26.0	$ 48.0	$ 54.3