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LONG-TERM DEBT AND CREDIT FACILITIES - Debt repayments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Long-term debt |  |  |
Total debt payable |  | $ 1,850.0 |
Repayment of debt |  | 200.0 | $ 80.0
2021 |  |  |
Long-term debt |  |  |
Total debt payable |  | 500.0 |
2024 |  |  |
Long-term debt |  |  |
Total debt payable |  | 600.0 |
2025+ |  |  |
Long-term debt |  |  |
Total debt payable |  | 750.0 |
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 |  |  |
Long-term debt |  |  |
Total debt payable |  | 500.0 |
Senior notes | 2025+ |  |  |
Long-term debt |  |  |
Total debt payable |  | 750.0 |
Revolving credit facility |  |  |
Long-term debt |  |  |
Total debt payable |  | 100.0 |
Repayment of debt | $ 100.0 |  |
Revolving credit facility | 2024 |  |  |
Long-term debt |  |  |
Total debt payable |  | $ 100.0 |

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