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ACQUISITIONS AND DISPOSITIONS - Acquisition (Details) $ in Millions | Feb. 14, 2018 USD ($) item | Jan. 31, 2019 USD ($) | Jan. 30, 2019 USD ($) | Mar. 31, 2018 | Feb. 02, 2018 USD ($) | Dec. 31, 2017
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Brazil | Acquisition |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Number of hydroelectric power plants acquired | item | 2 |  |  |  |  |
Purchase price | $ 257.0 |  |  |  |  |
Phase 7 concessions | MDO |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  | 50.00%
SDCA | Phase 7 concessions |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  | 50.00%
SDCA | Phase 7 concessions | MDO | Acquisition |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Purchase price |  |  |  |  | $ 65.0 |
SDCA | Phase 7 concessions | MDO | Forecast | Acquisition |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Percentage of equity interest |  |  |  | 100.00% |  |
Purchase price |  | $ 30.0 | $ 35.0 |  |  |

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