Vectren Fuels Acquisition

12 Months Ended

Dec. 31, 2016

Vectren Fuels [Member]

Business Acquisition [Line Items]

Vectren Fuels Acquisition

(2)  Vectren Fuels Acquisition 

On August 29, 2014, we consummated the acquisition of all the common stock of Vectren Fuels, Inc. (VFI) for $311 million, which was accounted for as a business acquisition requiring measurement of acquired assets and assumed liabilities at their estimated fair value in applying purchase accounting.  The estimated fair values are based on market participant assumptions.