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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 2,646.9	$ 2,675.5	$ 3,308.9
Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	1,854.0	1,930.2	2,407.0
Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	792.9	745.3	901.9
North America
Disaggregation of Revenue [Line Items]
Revenues	2,136.5	2,189.2	2,739.9
North America | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	1,457.5	1,541.9	1,970.4
North America | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	679.0	647.3	769.5
International
Disaggregation of Revenue [Line Items]
Revenues	510.4	486.3	569.0
International | Regulated Waste and Compliance Services
Disaggregation of Revenue [Line Items]
Revenues	396.5	388.3	436.6
International | Secure Information Destruction Services
Disaggregation of Revenue [Line Items]
Revenues	$ 113.9	$ 98.0	$ 132.4