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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments on Consolidated Statements of Income and Accumulated Other Comprehensive Income
The table below 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. The table also shows the pre-tax effects of the derivative instruments designated as cash flow hedges on OCI:
 
Financial Statement Location of Gain (Loss)
Year Ended December 31,
Instrument and Activity
2013
 
2012
 
2011
 
 
(in millions)
Fair Value Hedge
 
 
 
 
 
 
Questar Corporation
 
 
 
 
 
 
Interest rate derivative instrument
 
 
 
 
 
 
Realized and unrealized gain
Interest expense
$
—

 
$
—

 
$
9.8

2.75% Notes due 2016
 
 
 
 
 
 
Unrealized loss
Interest expense
—

 
—

 
(9.8
)
 
 
 
 
 
 
 
Cash Flow Hedges
 
 
 
 
 
 
Questar Pipeline
 
 
 
 
 
 
Interest rate derivative instruments
 
 
 
 
 
 
Deferrals of effective portions
OCI
$
—

 
$
—

 
$
(37.3
)
Losses reclassified from AOCI into earnings for effective portions
Interest expense
(0.5
)
 
(0.4
)
 
(0.1
)