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Derivative Instruments and Hedging Activities (Tables)
9 Months Ended
Sep. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments on Consolidated Statements of Income and Accumulated Other Comprehensive Income

The following table presents the pre-tax effects of the derivative instruments designated as a fair value hedge (including the hedged item) and cash flow hedges on the Consolidated Statements of Income as well as the pre-tax effects of the derivative instruments designated as cash flow hedges on OCI:

 
 
3 Months Ended
 
9 Months Ended
 
12 Months Ended
 
Financial Statement
September 30,
 
September 30,
 
September 30,
Instrument and Activity
Location of Gain (Loss)
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
 
(in millions)
Fair Value Hedge 
 
 
 
 
 
 
 
 
 
 
 
 
Questar Corporation 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate derivative instrument 
 
 
 
 
 
 
 
 
 
 
 
 
Realized gain
Interest expense
$

 
$
5.2

 
$

 
$
9.1

 
$
0.7

 
$
9.1

2.75% Notes due 2016 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized loss
Interest expense

 
(5.2
)
 

 
(9.1
)
 
(0.7
)
 
(9.1
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges 
 
 
 
 
 
 
 
 
 
 
 
 
Questar Pipeline 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate derivative instruments 
 
 
 
 
 
 
 
 
 
 
 
 
Deferrals of effective portions 
OCI

 
(37.0
)
 

 
(36.2
)
 
(1.1
)
 
(36.2
)
Losses reclassified from AOCI into earnings for effective portions
Interest expense
(0.2
)
 

 
(0.4
)
 

 
(0.5
)
 

Derivative instruments in Condensed Consolidated Balance Sheets

The following table discloses the Level 2 fair values of the asset and liability derivative instruments designated as hedges in the Condensed Consolidated Balance Sheets:

Instrument
Balance Sheet Location
Sept. 30, 2012
 
Sept. 30, 2011
 
Dec. 31, 2011
 
 
(in millions)
Assets
 
 
 
 
 
 
Questar Corporation
 
 
 
 
 
 
Interest rate derivative instrument
Prepaid expenses and other
$

 
$
0.5

 
$
1.1

Interest rate derivative instrument
Other noncurrent assets

 
7.7

 
7.8

Consolidated total - derivative assets
$

 
$
8.2

 
$
8.9

 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
Questar Pipeline
 
 
 
 
 
 
Interest rate derivative instruments
Accounts payable and accrued expenses
$

 
$
36.2

 
$

Consolidated total - derivative liabilities
$

 
$
36.2

 
$