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SUPPLEMENTAL CASH FLOW INFORMATION - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Supplemental Cash Flow Elements [Abstract]    
Cash paid for income taxes $ 1.3 $ 1.6
Cash paid for interest 0.8 0.0
Establishment of operating lease right-of-use assets and lease liabilities    
Operating lease right-of-use assets 8.7 46.1
Operating lease liabilities 9.2 46.1
Tenant improvement allowance not yet received 0.0 17.8
Purchases of property, plant and equipment in accounts payable and accrued liabilities 8.3 4.3
Capitalization of internal-use software in accounts payable and accrued liabilities $ 0.8 $ 0.0