Derivatives and Hedge Accounting Activities (Tables)

6 Months Ended

Jun. 30, 2017

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table presents the volume of Questar Gas' derivative activity at June 30, 2017. These volumes are based on open derivative positions and represent the combined absolute value of its long and short positions, except in the case of offsetting transactions, for which they represent the absolute value of the net volume of its long and short positions.

	Current		Noncurrent
Natural Gas (bcf):
Basis		12.1		25.9

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the fair values of Questar Gas' derivatives and where they are presented in its Balance Sheets.

	Fair Value - Derivatives not under Hedge Accounting		Total Fair Value
(millions)
At June 30, 2017
ASSETS
Current Assets
Commodity	$	0.3	$	0.3
Total current derivative assets(1)		0.3		0.3
Total derivative assets	$	0.3	$	0.3
LIABILITIES
Current Liabilities
Commodity	$	0.2	$	0.2
Total current derivative liabilities(2)		0.2		0.2
Noncurrent Liabilities
Commodity		0.4		0.4
Total noncurrent derivative liabilities(3)		0.4		0.4
Total derivative liabilities	$	0.6	$	0.6
At December 31, 2016
ASSETS
Current Assets
Commodity	$	0.1	$	0.1
Total current derivative assets(1)		0.1		0.1
Total derivative assets	$	0.1	$	0.1
LIABILITIES
Current Liabilities
Commodity	$	0.1	$	0.1
Total current derivative liabilities(2)		0.1		0.1
Total derivative liabilities	$	0.1	$	0.1

(1) Current derivative assets are presented in other current assets in Questar Gas' Balance Sheets.

(2) Current derivative liabilities are presented in other current liabilities in Questar Gas’ Balance Sheets.

(3) Noncurrent derivative liabilities are presented in other noncurrent liabilities in Questar Gas' Balance Sheets.

Derivative Instruments, Gain (Loss)

The following table presents the gains and losses on Questar Gas' derivatives, as well as where the associated activity is presented in its Statements of Income.

	Amountof Gain (Loss) Recognized in Income on Derivatives (1)
	Three Months Ended June 30,				Six Months Ended June 30,
Derivatives not designated as hedging instruments	2017		2016		2017			2016
(millions)
Derivative Type and Location of Gains    (Losses)
Commodity(2)	$	—	$	—	$	(0.5	)	$	—
Total	$	—	$	—	$	(0.5	)	$	—

(1) Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Questar Gas' Statements of Income.

(2) Amounts recorded in Questar Gas' Statements of Income are classified in cost of sales.