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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2024 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Federal statutory income tax rate, percent |  |  |  | 24.50% |  |  |  |
Tax Cuts And Jobs Act Of 2017, income tax benefit |  | $ (57.6) |  |  |  |  |  |
Forecasted effective tax rate | (7.20%) | 13.90% |  |  |  |  |  |
Forecasted tax credits, net of deferred tax |  | $ 21.9 |  |  |  |  |  |
Excess tax benefits associated with vesting of share-based awards | $ 1.3 | $ 2.8 |  |  |  |  |  |
Actual effective tax rate since tax effects of awards are treated as discrete item | (8.80%) | (68.20%) |  |  |  |  |  |
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables | $ 23.0 |  |  | $ 23.0 |  |  |  |
Deferred tax assets, operating loss carryforwards, domestic | 24.5 |  |  |  |  |  |  |
ITC carryforward | $ 145.4 |  |  | 121.1 |  |  |  |
ITC carryforward, expiration period | 20 years |  |  |  |  |  |  |
Valuation allowance | $ 4.1 |  |  | 4.0 |  |  |  |
Production tax credit, extension term | 5 years |  |  |  |  |  |  |
Production tax credit, project phase out, term | 3 years |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards | $ 136.8 |  |  | 136.8 |  |  |  |
State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards | $ 577.4 |  |  | $ 578.8 |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Federal statutory income tax rate, percent |  |  | 21.00% |  |  |  |  |
Forecasted tax credits, net of deferred tax |  |  | $ 47.7 |  |  |  |  |
Investment tax credit, solar property, percentage |  |  |  |  | 10.00% | 22.00% | 26.00% | 30.00%
Minimum | State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carryforward, expiration terms | 7 years |  |  |  |  |  |  |
Maximum | State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carryforward, expiration terms | 20 years |  |  |  |  |  |  |

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