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LONG-TERM DEBT AND CREDIT FACILITIES - Debt repayments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Long-term debt
Total debt payable	$ 1,750.0
2021
Long-term debt
Total debt payable	500.0
2024 and thereafter
Long-term debt
Total debt payable	1,250.0
Senior notes
Long-term debt
Total debt payable	1,750.0
Senior notes | 2021
Long-term debt
Total debt payable	500.0
Senior notes | 2024 and thereafter
Long-term debt
Total debt payable	$ 1,250.0

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- Definition

The amount of contractual undiscounted cash flows in relation to bank borrowings.

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