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CAPITAL AND FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt repayments      
Cash and cash equivalents $ 418.1 $ 531.5 $ 1,210.9
Liquidity risk | Long-term debt      
Debt repayments      
Contractual cash flow 3,360.6    
Liquidity risk | Not Later Than One Year [Member] | Long-term debt      
Debt repayments      
Contractual cash flow 189.4    
Liquidity risk | 2024-2027 | Long-term debt      
Debt repayments      
Contractual cash flow 2,663.4    
Liquidity risk | 2028+ | Long-term debt      
Debt repayments      
Contractual cash flow $ 507.8