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FINANCIAL RISK MANAGEMENT (Liquidity risk) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Borrowings less cash and cash equivalents and other current and non-current investments $ 1,734.9
Liquidity risk | 2019  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total 1,377.0
Liquidity risk | 2020  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total 597.0
Liquidity risk | 2021  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total 557.0
Liquidity risk | 2022  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total 539.0
Liquidity risk | Thereafter  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Total 116.0
Liquidity risk | Borrowings | 2019  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Borrowings 400.0
Liquidity risk | Borrowings | 2020  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Borrowings 528.0
Liquidity risk | Borrowings | 2021  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Borrowings 509.0
Liquidity risk | Borrowings | 2022  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Borrowings 510.0
Liquidity risk | Borrowings | Thereafter  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Borrowings 90.0
Liquidity risk | Interests to be accrued | 2019  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Interest to be accrued 70.0
Liquidity risk | Interests to be accrued | 2020  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Interest to be accrued 55.0
Liquidity risk | Interests to be accrued | 2021  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Interest to be accrued 35.0
Liquidity risk | Interests to be accrued | 2022  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Interest to be accrued 15.0
Liquidity risk | Interests to be accrued | Thereafter  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Interest to be accrued 4.0
Liquidity risk | Trade payables and other liabilities | 2019  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade payables and other liabilities 907.0
Liquidity risk | Trade payables and other liabilities | 2020  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade payables and other liabilities 14.0
Liquidity risk | Trade payables and other liabilities | 2021  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade payables and other liabilities 13.0
Liquidity risk | Trade payables and other liabilities | 2022  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade payables and other liabilities 14.0
Liquidity risk | Trade payables and other liabilities | Thereafter  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Trade payables and other liabilities $ 22.0