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INVESTMENTS IN AFFILIATES - Tax equity transactions (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2015
Oct. 31, 2015
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Class A membership interests          
Tax equity transactions          
Receipt of future cash flow distributions (as a percent)       51.00%  
Class B membership interests          
Tax equity transactions          
Receipt of future cash flow distributions (as a percent)       49.00%  
Tranquillity, Garland, and Roserock          
Tax equity transactions          
Payment received recognized as revenue         $ 190.4
Further contribution       $ 123.2 $ 69.5
Tranquillity          
Tax equity transactions          
Ownership Percentage 49.00%     49.00% 49.00%
Net assets derecognized         $ 93.9
Tranquillity | Class A membership interests          
Tax equity transactions          
Percentage of interest sold     100.00%    
Proceeds from sale of membership interest     $ 100.0    
Tranquillity | Class B membership interests          
Tax equity transactions          
Ownership Percentage     100.00%    
Garland          
Tax equity transactions          
Ownership Percentage 49.00%     49.00% 49.00%
Net assets derecognized         $ 56.4
Silverlake | Class A membership interests          
Tax equity transactions          
Percentage of interest sold   100.00%      
Proceeds from sale of membership interest   $ 49.0      
Silverlake | Class B membership interests          
Tax equity transactions          
Ownership Percentage   100.00%      
Roserock          
Tax equity transactions          
Ownership Percentage 49.00%     49.00% 49.00%
Net assets derecognized         $ 23.5
Roserock | Class A membership interests          
Tax equity transactions          
Percentage of interest sold 100.00%        
Proceeds from sale of membership interest $ 45.0        
Roserock | Class B membership interests          
Tax equity transactions          
Ownership Percentage 100.00%       100.00%