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CAPITAL AND FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Debt repayments |  |  |
Cash and cash equivalent balances | $ 1,025.8 | $ 827.0 | $ 1,043.9
Liquidity risk |  |  |
Debt repayments |  |  |
Cash and cash equivalent balances | 1,025.8 |  |
Liquidity risk | Long-term debt |  |  |
Debt repayments |  |  |
Long-term debt | 2,684.0 |  |
Liquidity risk | 2018 | Long-term debt |  |  |
Debt repayments |  |  |
Long-term debt | 95.6 |  |
Liquidity risk | 2019, 2020 | Long-term debt |  |  |
Debt repayments |  |  |
Long-term debt | 190.2 |  |
Liquidity risk | 2021, 2022 | Long-term debt |  |  |
Debt repayments |  |  |
Long-term debt | 664.5 |  |
Liquidity risk | 2023 and thereafter | Long-term debt |  |  |
Debt repayments |  |  |
Long-term debt | $ 1,733.7 |  |

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