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VARIABLE INTEREST ENTITIES (Details) $ in Millions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) MW | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Variable interest entities |  |  |  |  |  |
Equity investment | $ 1,720.4 | $ 1,696.5 | $ 1,665.3 | $ 1,613.7 | $ 1,596.6 | $ 1,553.4
ATC |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |
Equity investment | $ 1,679.8 |  | 1,625.3 |  |  |
ATC Holdco |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |  |  |
Equity investment | $ 40.6 |  | $ 40.0 |  |  |
Purchased power agreement |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Firm capacity from purchased power agreement (in megawatts) | MW | 236 |  |  |  |  |
Minimum energy requirements over remaining term of purchased power agreement (in megawatts) | MW | 0 |  |  |  |  |
Remaining term of purchased power agreement (in years) | 3 years |  |  |  |  |
Residual guarantee associated with purchased power agreement | $ 0.0 |  |  |  |  |
Required payments over remaining term of purchased power agreement | $ 24.4 |  |  |  |  |

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