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CAPITAL AND FINANCIAL RISK MANAGEMENT - Liquidity risk (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt repayments |  |  |
Cash and cash equivalents | $ 1,210.9 | $ 575.1 | $ 349.0
Liquidity risk | Long-term debt |  |  |
Debt repayments |  |  |
Contractual cash flow | 2,640.0 |  |
Liquidity risk | 2021 | Long-term debt |  |  |
Debt repayments |  |  |
Contractual cash flow | 604.5 |  |
Liquidity risk | 2022-2025 | Long-term debt |  |  |
Debt repayments |  |  |
Contractual cash flow | 870.9 |  |
Liquidity risk | 2026+ | Long-term debt |  |  |
Debt repayments |  |  |
Contractual cash flow | $ 1,164.6 |  |

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