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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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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities.

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