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Accumulated Other Comprehensive Income (Notes)
 9 Months Ended
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income

Comprehensive income, as reported in Questar's Condensed Consolidated Statements of Comprehensive Income, is the sum of net income as reported in the Questar Consolidated Statements of Income and net other comprehensive income (loss) (OCI). OCI includes recognition of the under-funded position of pension and other postretirement benefit plans, interest rate and commodity-based cash flow hedges, changes in the fair value of long-term investment, and the related income taxes. Income or loss is recognized when the pension and other postretirement benefit (OPB) costs are accrued, as the Company records interest expense for hedged interest payments, as the Company reaches settlement of commodity-based hedges and when the long-term investment is sold.

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 OPB
 
Interest rate cash flow hedges
 
Commodity cash flow hedges
 
Long-term investment
 
Total
3 Months Ended September 30, 2015
 
(in millions)
AOCI at beginning of period
$
(171.4
)
 
$
(22.3
)
 
$
(0.2
)
 
$
0.1

 
$
(193.8
)
OCI before reclassifications
—

 
—

 
0.5

 
—

 
0.5

Reclassified from AOCI(1)
6.7

 
0.1

 
—

 
—

 
6.8

Income taxes
 
 
 
 
 
 
 
 
 
OCI before reclassifications
—

 
—

 
(0.2
)
 
—

 
(0.2
)
Reclassified from AOCI(2)
(2.6
)
 
(0.1
)
 
—

 
—

 
(2.7
)
Total income taxes
(2.6
)
 
(0.1
)
 
(0.2
)
 
—

 
(2.9
)
Net other comprehensive income
4.1

 
—

 
0.3

 
—

 
4.4

AOCI at end of period
$
(167.3
)
 
$
(22.3
)
 
$
0.1

 
$
0.1

 
$
(189.4
)

 
Pension and OPB
 
Interest rate cash flow hedges
 
Long-term investment
 
Total
3 Months Ended September 30, 2014
 
(in millions)
AOCI at beginning of period
$
(113.7
)
 
$
(22.7
)
 
$
0.1

 
$
(136.3
)
Reclassified from AOCI(1)
3.7

 
0.1

 
—

 
3.8

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

 
—

 
(1.3
)
Total income taxes
(1.3
)
 
—

 
—

 
(1.3
)
Net other comprehensive income
2.4

 
0.1

 
—

 
2.5

AOCI at end of period
$
(111.3
)
 
$
(22.6
)
 
$
0.1

 
$
(133.8
)

 
Pension and OPB
 
Interest rate cash flow hedges
 
Commodity cash flow hedges
 
Long-term investment
 
Total
9 Months Ended September 30, 2015
 
(in millions)
AOCI at beginning of period
$
(178.9
)
 
$
(22.5
)
 
$
—

 
$
0.1

 
$
(201.3
)
OCI before reclassifications
—

 
—

 
0.2

 
—

 
0.2

Reclassified from AOCI(1)
18.7

 
0.5

 
—

 
—

 
19.2

Income taxes
 
 
 
 
 
 
 
 
 
OCI before reclassifications
—

 
—

 
(0.1
)
 
—

 
(0.1
)
Reclassified from AOCI(2)
(7.1
)
 
(0.3
)
 
—

 
—

 
(7.4
)
Total income taxes
(7.1
)
 
(0.3
)
 
(0.1
)
 
—

 
(7.5
)
Net other comprehensive income
11.6

 
0.2

 
0.1

 
—

 
11.9

AOCI at end of period
$
(167.3
)
 
$
(22.3
)
 
$
0.1

 
$
0.1

 
$
(189.4
)

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

 
$
(141.8
)
Reclassified from AOCI(1)
12.5

 
0.4

 
—

 
12.9

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

 
(4.9
)
Total income taxes
(4.8
)
 
(0.1
)
 
—

 
(4.9
)
Net other comprehensive income
7.7

 
0.3

 
—

 
8.0

AOCI at end of period
$
(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.

Pension and other postretirement benefit AOCI reclassifications are included in the computation of net periodic pension and postretirement benefit costs. See Note 9 for additional details.

Comprehensive income, as reported in Questar Pipeline's Condensed Consolidated Statements of Comprehensive Income, is the sum of net income as reported in the Questar Pipeline Consolidated Statements of Income and net OCI. OCI includes interest rate and commodity-based cash flow hedges and the related income taxes. Income or loss is recognized as the company records interest expense for hedged interest payments and as the company reaches settlement of commodity-based hedges. Disclosures above regarding interest rate and commodity-based cash flow hedges, including related income taxes and income statement reclassification effects, apply to Questar Pipeline.