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Variable Interest Entities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
ATC |  |
Variable interest entities |  |
Equity method investment, ownership interest (as a percent) | 60.00% |
Equity investment | $ 1,625.3 | $ 1,515.8
ATC distributions receivable |  | 39.9
Accounts payable for services received from ATC | $ 28.2 | 31.2
ATC HoldCo |  |
Variable interest entities |  |
Equity method investment, ownership interest (as a percent) | 75.00% |
Equity investment | $ 40.0 | $ 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) | 3 years |
Residual guarantee associated with purchased power agreement | $ 0.0 |
Required payments over remaining term of purchased power agreement | $ 56.7 |

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