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Variable Interest Entities (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) MW | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
ATC |  |  |  |
Variable interest entities |  |  |  |
Equity method investment, ownership interest (as a percent) |  | 60.00% |  |
Equity investment in ATC |  | $ 1,443.9 | $ 1,380.9 |
Accounts payable to related parties |  | $ 28.7 | 28.3 |
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 |  | 85.3 |  |
Total capacity and lease payments under purchased power agreement |  | $ 54.2 | $ 53.6 | $ 53.0
Accounting Standards Update 2015-02 |  |  |  |
Variable interest entities |  |  |  |
Changes to disclosures and financial statement presentation | $ 0.0 |  |  |

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