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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 669.5	$ 679.8	$ 1,353.8	$ 1,344.0
North America
Disaggregation of Revenue [Line Items]
Revenues	565.2	568.6	1,138.6	1,112.3
International
Disaggregation of Revenue [Line Items]
Revenues	104.3	111.2	215.2	231.7
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	444.7	448.4	896.0	901.2
Regulated Waste and Compliance Services | North America
Disaggregation of Revenue [Line Items]
Revenues	366.4	365.6	735.1	727.8
Regulated Waste and Compliance Services | International
Disaggregation of Revenue [Line Items]
Revenues	78.3	82.8	160.9	173.4
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	224.8	231.4	457.8	442.8
Secure Information Destruction Services | North America
Disaggregation of Revenue [Line Items]
Revenues	198.8	203.0	403.5	384.5
Secure Information Destruction Services | International
Disaggregation of Revenue [Line Items]
Revenues	$ 26.0	$ 28.4	$ 54.3	$ 58.3