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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 648.4	$ 653.5	$ 1,974.9	$ 2,007.3
North America
Disaggregation of Revenue [Line Items]
Revenues	554.4	557.1	1,691.2	1,695.7
International
Disaggregation of Revenue [Line Items]
Revenues	94.0	96.4	283.7	311.6
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	438.7	439.9	1,329.0	1,335.9
Regulated Waste and Compliance Services | North America
Disaggregation of Revenue [Line Items]
Revenues	369.2	368.0	1,117.8	1,103.1
Regulated Waste and Compliance Services | International
Disaggregation of Revenue [Line Items]
Revenues	69.5	71.9	211.2	232.8
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	209.7	213.6	645.9	671.4
Secure Information Destruction Services | North America
Disaggregation of Revenue [Line Items]
Revenues	185.2	189.1	573.4	592.6
Secure Information Destruction Services | International
Disaggregation of Revenue [Line Items]
Revenues	$ 24.5	$ 24.5	$ 72.5	$ 78.8