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VARIABLE INTEREST ENTITIES (Details) $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) MW | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Variable interest entities |  |  |  |  |  |
Equity investment | $ 1,613.7 | $ 1,560.8 | $ 1,596.6 | $ 1,553.4 | $ 1,544.0 | $ 1,443.9
ATC |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |
Equity investment | $ 1,574.2 |  |  | 1,515.8 |  |
ATC distributions receivable | 27.7 |  |  | 39.9 |  |
Accounts payable due to ATC | $ 28.1 |  |  | 31.2 |  |
ATC Holdco |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |  |  |
Equity investment | $ 39.5 |  |  | $ 37.6 |  |
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) | 4 years |  |  |  |  |
Residual guarantee associated with purchased power agreement | $ 0.0 |  |  |  |  |
Required payments over remaining term of purchased power agreement | 60.4 |  |  |  |  |
Total capacity and lease payments | $ 14.1 | $ 13.5 |  |  |  |

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