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CAPITAL AND FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt repayments      
Cash and cash equivalents $ 575.1 $ 349.0 $ 1,025.8
Liquidity risk | Long-term debt      
Debt repayments      
Contractual cash flow 2,610.3    
Liquidity risk | 2020 | Long-term debt      
Debt repayments      
Contractual cash flow 98.5    
Liquidity risk | 2021-2024 | Long-term debt      
Debt repayments      
Contractual cash flow 1,402.1    
Liquidity risk | 2025+ | Long-term debt      
Debt repayments      
Contractual cash flow $ 1,109.7