Regulatory Matters	9 Months Ended
Sep. 30, 2016
Regulatory Matters [Abstract]
Regulatory Matters	Regulatory Matters Union Gas. In December 2015, Union Gas filed an application with the OEB for the disposition of the 2014 demand side management (DSM) deferral and variance account balances. As a result of this application, Union Gas has a receivable from customers of approximately $9 million as of September 30, 2016 and $8 million as of December 31, 2015, which is reflected as Current Assets—Other on the Condensed Consolidated Balance Sheets. In June 2016, the OEB approved Union Gas’ application as filed and Union Gas has begun to recover the receivable from ratepayers effective October 1, 2016. In March 2016, Union Gas filed a Draft Rate Order with the OEB for rates effective January 1, 2016 based on the OEB’s February 24, 2016 updated Decision and Order on the 2015-2020 DSM Plan. In May 2016, a decision from the OEB was received approving recovery from ratepayers of approximately $19 million effective January 1, 2016 with an implementation date of July 1, 2016. In April 2016, Union Gas filed an application with the OEB for the annual disposition of the 2015 deferral account balances. As a result, Union Gas has a net receivable from customers of approximately $18 million as of September 30, 2016 and December 31, 2015, which is primarily reflected as Current Assets—Other on the Condensed Consolidated Balance Sheets. Union Gas filed a Settlement Proposal with the OEB in July 2016 reflecting a full settlement on all issues in the proceeding. In August 2016, the OEB approved the Settlement Proposal as filed. Union Gas has begun to implement the disposition of the balances effective October 1, 2016.

Regulatory Matters

Union Gas. In December 2015, Union Gas filed an application with the OEB for the disposition of the 2014 demand side management (DSM) deferral and variance account balances. As a result of this application, Union Gas has a receivable from customers of approximately $9 million as of September 30, 2016 and $8 million as of December 31, 2015, which is reflected as Current Assets—Other on the Condensed Consolidated Balance Sheets. In June 2016, the OEB approved Union Gas’ application as filed and Union Gas has begun to recover the receivable from ratepayers effective October 1, 2016.

In March 2016, Union Gas filed a Draft Rate Order with the OEB for rates effective January 1, 2016 based on the OEB’s February 24, 2016 updated Decision and Order on the 2015-2020 DSM Plan. In May 2016, a decision from the OEB was received approving recovery from ratepayers of approximately $19 million effective January 1, 2016 with an implementation date of July 1, 2016.

In April 2016, Union Gas filed an application with the OEB for the annual disposition of the 2015 deferral account balances. As a result, Union Gas has a net receivable from customers of approximately $18 million as of September 30, 2016 and December 31, 2015, which is primarily reflected as Current Assets—Other on the Condensed Consolidated Balance Sheets. Union Gas filed a Settlement Proposal with the OEB in July 2016 reflecting a full settlement on all issues in the proceeding. In August 2016, the OEB approved the Settlement Proposal as filed. Union Gas has begun to implement the disposition of the balances effective October 1, 2016.