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Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event [Line Items]      
Proceeds from sale of assets   $ 0.8 $ 0.5
Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from sale of assets $ 975.0    
CEGP | Subsequent Event      
Subsequent Event [Line Items]      
Ownership Percentage 50.00%