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CAPITAL AND FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt repayments      
Cash and cash equivalent balances $ 349.0 $ 1,025.8 $ 827.0
Liquidity risk      
Debt repayments      
Cash and cash equivalent balances 349.0    
Liquidity risk | Long-term debt      
Debt repayments      
Long-term debt 2,588.4    
Liquidity risk | 2019 | Long-term debt      
Debt repayments      
Long-term debt 95.1    
Liquidity risk | 2020, 2021 | Long-term debt      
Debt repayments      
Long-term debt 690.1    
Liquidity risk | 2022, 2023 | Long-term debt      
Debt repayments      
Long-term debt 138.9    
Liquidity risk | 2024 and thereafter | Long-term debt      
Debt repayments      
Long-term debt $ 1,664.3