Derivative Instruments Volume of Derivative Activity (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments [Table Text Block]

Business unit	Commodity	Quantity hedged (in millions)	Designation	Longest Expiration date of hedge
PESCO	Natural gas (Dts)	22.1	Cash flows hedges	March 2022
PESCO	Natural gas (Dts)	1.1	Not designated	January 2020
Sharp	Propane (gallons)	4.4	Cash flows hedges	June 2021
Sharp	Propane (gallons)	0.3	Fair value hedges	March 2019