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LONG-TERM DEBT AND CREDIT FACILITIES - Senior notes (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019
Long-term debt |  |
Principal amount | $ 1,947.7 |
Senior notes |  |
Long-term debt |  |
Principal amount | $ 1,747.7 |
Redemption price (as a percent) | 100.00% |
Redeem of the principal amount (as a percent) | 100.00% |
Prior to maturity upon certain fundamental changes | 101.00% |
Senior notes | Minimum |  |
Long-term debt |  |
Interest rate (as a percent) | 4.50% | 4.50%
Premium add to the redemption price (as a percent) | 45 |
Senior notes | Maximum |  |
Long-term debt |  |
Interest rate (as a percent) | 6.875% | 6.875%
Premium add to the redemption price (as a percent) | 50 |
5.125% senior notes |  |
Long-term debt |  |
Interest rate (as a percent) | 5.125% |
Principal amount | $ 500.0 |
Redeemable period, before maturity date | 3 months |
5.950% senior notes |  |
Long-term debt |  |
Interest rate (as a percent) | 5.95% |
Principal amount | $ 500.0 |
Redeemable period, before maturity date | 3 months |
4.50% senior notes |  |
Long-term debt |  |
Interest rate (as a percent) | 4.50% |
Principal amount | $ 500.0 |
Redeemable period, before maturity date | 3 months |
6.875% senior notes |  |
Long-term debt |  |
Interest rate (as a percent) | 6.875% |
Principal amount | $ 250.0 |
Redeemable period, before maturity date | 6 months |

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