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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2013
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
 
6 Months Ended
 
12 Months Ended
 
Financial Statement Location of Gain (Loss)
June 30,
 
June 30,
 
June 30,
Instrument and Activity
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
 
(in millions)
Fair Value Hedge 
 
 
 
 
 
 
 
 
 
 
 
 
Questar Corporation 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate derivative instrument 
 
 
 
 
 
 
 
 
 
 
 
 
Realized gain
Interest expense
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
5.9

2.75% Notes due 2016 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized loss
Interest expense
—

 
—

 
—

 
—

 
—

 
(5.9
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Flow Hedges 
 
 
 
 
 
 
 
 
 
 
 
 
Questar Pipeline 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate derivative instruments 
 
 
 
 
 
 
 
 
 
 
 
 
Deferrals of effective portions 
OCI
—

 
—

 
—

 
—

 
—

 
(38.1
)
Losses reclassified from AOCI into earnings for effective portions
Interest expense
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.2
)
 
(0.5
)
 
(0.3
)