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SUPPLEMENTAL CASH FLOW INFORMATION - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 9 Months Ended
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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

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