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VARIABLE INTEREST ENTITIES (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) MW | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Variable interest entities |  |  |
Equity investment in ATC | $ 1,560.8 |  | $ 1,443.9
ATC |  |  |
Variable interest entities |  |  |
Ownership interest in ATC (as a percent) | 60.00% |  |
Equity investment in ATC | $ 1,560.8 |  | 1,443.9
ATC distributions receivable |  |  | 35.2
Accounts payable due to ATC | $ 29.1 |  | $ 28.7
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) | 5 years |  |
Residual guarantee associated with purchased power agreement | $ 0.0 |  |
Required payments over remaining term of purchased power agreement | 74.9 |  |
Total capacity and lease payments | $ 13.5 | $ 40.5 |

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