Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

The following table discloses the carrying amount and estimated fair value of certain financial instruments not disclosed in other notes to Questar's Financial Statements in this Annual Report on Form 10-K:



	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
	December 31, 2011				December 31, 2010
	(in millions)
Financial assets
Cash and cash equivalents	$	11.6	$	11.6	$	21.8	$	21.8
Long-term investment	14.4		14.4		13.1		13.1
Financial liabilities
Short-term debt	219.0		219.0		242.0		242.0
Long-term debt, including current portion	1,084.5		1,223.4		1,080.5		1,173.8

Questar Pipeline [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value, by Balance Sheet Grouping

The following table discloses the carrying amount and estimated fair value of certain financial instruments not disclosed in other notes to Questar Pipeline's Financial Statements in this Annual Report on Form 10-K:



	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
	December 31, 2011				December 31, 2010
	(in millions)
Financial assets
Cash and cash equivalents	$	3.4	$	3.4	$	5.3	$	5.3
Notes receivable from Questar	8.8		8.8		30.3		30.3
Financial liabilities
Long-term debt, including current portion	459.0		519.4		460.9		501.9

Questar Gas [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value, by Balance Sheet Grouping

The following table discloses the carrying amount and estimated fair value of certain financial instruments not disclosed in other notes to Questar Gas's Financial Statements in this Annual Report on Form 10-K:



	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
	December 31, 2011				December 31, 2010
	(in millions)
Financial assets
Cash and cash equivalents	$	5.0	$	5.0	$	4.7	$	4.7
Financial liabilities
Notes payable to Questar	142.7		142.7		153.6		153.6
Long-term debt, including current portion	368.0		445.4		370.0		425.3

- Definition

This item represents certain of the disclosures concerning the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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