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Discontinued Operations, Acquisitions and Dispositions - Dispositions of Majority Interest in EVgo (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 17, 2016 USD ($) charging_station parking_space | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on sale |  |  | $ (34.0) | $ 70.0 | $ 14.0
Equity method investments |  |  | 1,038.0 | $ 1,120.0 |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | EVgo |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration | $ 39.0 |  |  |  |
Cash received | 17.0 |  |  |  |
Working capital adjustments | 2.5 |  |  |  |
Capital contributions | 15.0 |  |  |  |
Future capital contributions | 7.0 |  |  |  |
Future earnout potential | 70.0 |  |  |  |
Financial obligations under agreement | $ 102.5 |  |  |  |
Number of public fast charging Freedom stations | charging_station | 200 |  |  |  |
Number of commercial and multiifamily parking spaces | parking_space | 10,000 |  |  |  |
Loss on sale |  | $ 78.0 |  |  |
Loss on sale of equity the interest |  | $ 27.0 |  |  |
Remaining obligation | $ 56.0 |  | $ 25.0 |  |
Remainin ownership interest |  |  | 35.00% |  |
Equity method investments |  |  | $ 1.0 |  |

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