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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2013
Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Details of the changes in the components of AOCI, net of income taxes, as reported in Questar's Consolidated Balance Sheets, are shown in the table below. The table also discloses details of income taxes related to each component of OCI:
 
Pension
 
OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
Actuarial loss
 
Prior service cost
 
Total
 
Actuarial loss
 
 
 
 
Year Ended December 31, 2013
 
(in millions)
AOCI at beginning of year
$
(202.4
)
 
$
(1.1
)
 
$
(203.5
)
 
$
(19.7
)
 
$
(23.2
)
 
$
0.1

 
$
(246.3
)
OCI before reclassifications
123.4

 
—

 
123.4

 
12.4

 
—

 
(0.1
)
 
135.7

Reclassified from AOCI(1)
28.9

 
1.1

 
30.0

 
3.0

 
0.5

 
—

 
33.5

Income taxes
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI before reclassifications
(47.2
)
 
—

 
(47.2
)
 
(4.7
)
 
—

 
0.1

 
(51.8
)
Reclassified from AOCI(2)
(11.1
)
 
(0.4
)
 
(11.5
)
 
(1.2
)
 
(0.2
)
 
—

 
(12.9
)
Total income taxes
(58.3
)
 
(0.4
)
 
(58.7
)
 
(5.9
)
 
(0.2
)
 
0.1

 
(64.7
)
Net other comprehensive income
94.0

 
0.7

 
94.7

 
9.5

 
0.3

 
—

 
104.5

AOCI at end of year
$
(108.4
)
 
$
(0.4
)
 
$
(108.8
)
 
$
(10.2
)
 
$
(22.9
)
 
$
0.1

 
$
(141.8
)

(1) Interest rate cash flow hedge amounts are included in their entirety as charges to interest expense on the Consolidated Statements of Income.
(2) Interest rate cash flow hedge amounts are included in their entirety as credits to income taxes on the Consolidated Statements of Income.
Income taxes allocated to each component of consolidated OCI
For years not disclosed in the above table, income taxes allocated to each component of Questar's consolidated OCI are shown below. Expenses are in parentheses.
 
Year Ended December 31,
 
2012
 
2011
 
(in millions)
Change in unrecognized actuarial loss
$
13.6

 
$
62.3

Change in unrecognized prior service cost
(1.0
)
 
(1.1
)
Interest rate cash flow hedges
(0.2
)
 
13.8

Change in fair value of long-term investment
(0.1
)
 
—

Income taxes
$
12.3

 
$
75.0