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LONG-TERM DEBT AND CREDIT FACILITIES - Senior notes (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 06, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Long-term debt |  |  |  |
Proceeds from debt net of issuance costs | $ 494.7 |  |  |
Principal amount |  |  | $ 1,745.7 |
Debt repayments |  |  | 500.0 | $ 425.0
Senior notes |  |  |  |
Long-term debt |  |  |  |
Principal amount |  |  | $ 1,750.0 |
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 |  |  |  |
Premium add to the redemption price (as a percent) |  |  | 40.00% |
Senior notes | Maximum |  |  |  |
Long-term debt |  |  |  |
Premium add to the redemption price (as a percent) |  |  | 50.00% |
4.50% senior notes |  |  |  |
Long-term debt |  |  |  |
Debt securities | $ 500.0 |  |  |
Interest Rates (as a percent) | 4.50% |  | 4.50% |
Principal amount |  |  | $ 500.0 |
Redeemable period, before maturity date |  |  | 3 months |
5.125% senior notes |  |  |  |
Long-term debt |  |  |  |
Interest Rates (as a percent) |  |  | 5.125% |
Principal amount |  |  | $ 500.0 |
Redeemable period, before maturity date |  |  | 3 months |
5.950% senior notes |  |  |  |
Long-term debt |  |  |  |
Interest Rates (as a percent) |  |  | 5.95% |
Principal amount |  |  | $ 500.0 |
Redeemable period, before maturity date |  |  | 3 months |
6.875% senior notes |  |  |  |
Long-term debt |  |  |  |
Interest Rates (as a percent) |  |  | 6.875% |
Principal amount |  |  | $ 250.0 |
Redeemable period, before maturity date |  |  | 6 months |
3.625% senior notes |  |  |  |
Long-term debt |  |  |  |
Interest Rates (as a percent) |  | 3.625% |  |
Debt repayments |  | $ 250.0 |  |

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