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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Supplemental Cash Flow Elements [Abstract]      
Cash paid for income taxes $ 1.9 $ 1.8 $ 4.6
Cash paid for interest 1.4 0.0 4.4
Cash received for income tax receivables 0.0 0.0 90.0
Change in operating lease right-of-use assets and lease liabilities      
Operating lease right-of-use assets (31.0) 46.9 41.8
Operating lease liabilities 36.7 (46.9) (48.1)
Tenant improvement allowance not yet received 0.0 22.9 0.0
Purchases of property, plant and equipment and capitalization of internal-use software in accounts payable and accrued liabilities $ 6.9 $ 10.0 $ 0.0