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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Details of the changes in the components of consolidated accumulated other comprehensive income (loss) (AOCI), net of income taxes, as reported in Questar's Condensed Consolidated Balance Sheets, are shown in the tables below. The tables also disclose details of income taxes related to each component of OCI.
 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
3 Months Ended
 
3 Months Ended
 
September 30, 2014
 
September 30, 2013
 
(in millions)
AOCI at beginning of period
$
(113.7
)
 
$
(22.7
)
 
$
0.1

 
$
(136.3
)
 
$
(213.5
)
 
$
(23.0
)
 
$
0.1

 
$
(236.4
)
Reclassified from AOCI(1)
3.7

 
0.1

 
—

 
3.8

 
9.0

 
0.1

 
—

 
9.1

Income taxes
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Reclassified from AOCI(2)
(1.3
)
 
—

 
—

 
(1.3
)
 
(3.4
)
 
—

 
—

 
(3.4
)
Net other comprehensive income
2.4

 
0.1

 
—

 
2.5

 
5.6

 
0.1

 
—

 
5.7

AOCI at September 30,
$
(111.3
)
 
$
(22.6
)
 
$
0.1

 
$
(133.8
)
 
$
(207.9
)
 
$
(22.9
)
 
$
0.1

 
$
(230.7
)


 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
9 Months Ended
 
9 Months Ended
 
September 30, 2014
 
September 30, 2013
 
(in millions)
AOCI at beginning of period
$
(119.0
)
 
$
(22.9
)
 
$
0.1

 
$
(141.8
)
 
$
(223.2
)
 
$
(23.2
)
 
$
0.1

 
$
(246.3
)
OCI before reclassifications
—

 
—

 
—

 
—

 
—

 
—

 
(0.1
)
 
(0.1
)
Reclassified from AOCI(1)
12.5

 
0.4

 
—

 
12.9

 
24.7

 
0.4

 
—

 
25.1

Income taxes
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI before reclassifications
—

 
—

 
—

 
—

 
—

 
—

 
0.1

 
0.1

Reclassified from AOCI(2)
(4.8
)
 
(0.1
)
 
—

 
(4.9
)
 
(9.4
)
 
(0.1
)
 
—

 
(9.5
)
Total income taxes
(4.8
)
 
(0.1
)
 
—

 
(4.9
)
 
(9.4
)
 
(0.1
)
 
0.1

 
(9.4
)
Net other comprehensive income
7.7

 
0.3

 
—

 
8.0

 
15.3

 
0.3

 
—

 
15.6

AOCI at September 30,
$
(111.3
)
 
$
(22.6
)
 
$
0.1

 
$
(133.8
)
 
$
(207.9
)
 
$
(22.9
)
 
$
0.1

 
$
(230.7
)

 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
12 Months Ended
 
September 30, 2014
 
(in millions)
AOCI at beginning of period
$
(207.9
)
 
$
(22.9
)
 
$
0.1

 
$
(230.7
)
OCI before reclassifications
135.8

 
—

 
—

 
135.8

Reclassified from AOCI(1)
20.8

 
0.5

 
—

 
21.3

Income taxes
 
 
 
 
 
 
 
OCI before reclassifications
(51.9
)
 
—

 
—

 
(51.9
)
Reclassified from AOCI(2)
(8.1
)
 
(0.2
)
 
—

 
(8.3
)
Total income taxes
(60.0
)
 
(0.2
)
 
—

 
(60.2
)
Net other comprehensive income
96.6

 
0.3

 
—

 
96.9

AOCI at September 30,
$
(111.3
)
 
$
(22.6
)
 
$
0.1

 
$
(133.8
)

(1) Interest rate cash flow hedge amounts are included in their entirety as charges to interest expense on the Consolidated Statements of Income.
(2) Income tax reclassifications related to interest rate cash flow hedge amounts are included in their entirety as credits to income taxes on the Consolidated Statements of Income.