ACQUISITIONS AND DISPOSITIONS - Summary of Estimated Fair Values Assigned to Net Assets (Details) $ in Millions, $ in Millions	Sep. 27, 2022 CAD ($)	Sep. 27, 2022 USD ($)	Sep. 30, 2023 CAD ($)	Dec. 31, 2022 CAD ($)	Sep. 27, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 32,390.0	$ 32,440.0
TRI GLOBAL ENERGY, LLC
Business Acquisition [Line Items]
Current assets	$ 5.0
Property, plant and equipment	3.0
Long-term investments	8.0
Intangible assets	117.0
Long-term assets	3.0
Current liabilities	61.0
Long-term debt	18.0
Long-term liabilities	105.0
Goodwill	392.0
Purchase price:
Cash	295.0	$ 215
Contingent consideration	49.0				$ 36
Purchase price	$ 344.0
Expected useful life	3 years 6 months				3 years 6 months
Goodwill expected tax deductible period	15 years	15 years
Business combination, additional contingent consideration (up to)	$ 72.0				$ 53