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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair Value, by Balance Sheet Grouping
The following table discloses the carrying amount, estimated fair value and level within the fair value hierarchy of certain financial instruments not disclosed in other notes to Questar's financial statements in this Annual Report on Form 10-K:
 
Hierarchy Level of Fair Value Estimates
Carrying
Amount
 
Estimated
Fair Value
 
Carrying
Amount
 
Estimated
Fair Value
 
 
December 31, 2013
 
December 31, 2012
 
 
(in millions)
Financial assets
 
 
 
 
 
 
 
 
Cash and cash equivalents
1
$
16.0

 
$
16.0

 
$
16.8

 
$
16.8

Long-term investment
1
17.3

 
17.3

 
15.5

 
15.5

Financial liabilities
 
 
 
 
 
 
 
 
Short-term debt
1
276.0

 
276.0

 
263.0

 
263.0

Long-term debt, including current portion
2
1,247.1

 
1,310.8

 
1,140.9

 
1,303.1

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, estimated fair value and level within the fair value hierarchy of certain financial instruments not disclosed in other notes to Questar Gas's financial statements in this Annual Report on Form 10-K:
 
Hierarchy Level of Fair Value Estimates
Carrying
Amount
 
Estimated
Fair Value
 
Carrying
Amount
 
Estimated
Fair Value
 
 
December 31, 2013
 
December 31, 2012
 
 
(in millions)
Financial assets
 
 
 
 
 
 
 
 
Cash and cash equivalents
1
$
8.8

 
$
8.8

 
$
1.4

 
$
1.4

Financial liabilities
 
 
 
 
 
 
 
 
Notes payable to Questar
1
17.7

 
17.7

 
166.1

 
166.1

Long-term debt, including current portion
2
534.5

 
568.0

 
426.5

 
503.7

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, estimated fair value and level within the fair value hierarchy of certain financial instruments not disclosed in other notes to Questar Pipeline's financial statements in this Annual Report on Form
10-K:
 
Hierarchy Level of Fair Value Estimates
Carrying
Amount
 
Estimated
Fair Value
 
Carrying
Amount
 
Estimated
Fair Value
 
 
December 31, 2013
 
December 31, 2012
 
 
(in millions)
Financial assets
 
 
 
 
 
 
 
 
Cash and cash equivalents
1
$
2.7

 
$
2.7

 
$
7.1

 
$
7.1

Notes receivable from Questar
1
29.4

 
29.4

 
38.7

 
38.7

Financial liabilities
 
 
 
 
 
 
 
 
Long-term debt
2
458.9

 
486.0

 
458.9

 
536.6