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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 |  |

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