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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