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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2016
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 OPB
 
Interest rate cash flow hedges
 
Commodity cash flow hedges
 
Long-term investment
 
Total
3 Months Ended March 31, 2016
 
(in millions)
AOCI at beginning of period
$
(163.1
)
 
$
(22.2
)
 
$
(0.1
)
 
$
0.1

 
$
(185.3
)
OCI before reclassifications
—

 
—

 
(0.2
)
 
—

 
(0.2
)
Reclassified from AOCI(1)(3)
4.0

 
0.2

 
—

 
—

 
4.2

Income taxes
 
 
 
 
 
 
 
 
 
Reclassified from AOCI(2)(4)
(1.5
)
 
(0.1
)
 
—

 
—

 
(1.6
)
Total income taxes
(1.5
)
 
(0.1
)
 
—

 
—

 
(1.6
)
Net other comprehensive income (loss)
2.5

 
0.1

 
(0.2
)
 
—

 
2.4

AOCI at end of period
$
(160.6
)
 
$
(22.1
)
 
$
(0.3
)
 
$
0.1

 
$
(182.9
)

 
Pension and OPB
 
Interest rate cash flow hedges
 
Long-term investment
 
Total
3 Months Ended March 31, 2015
 
(in millions)
AOCI at beginning of period
$
(178.9
)
 
$
(22.5
)
 
$
0.1

 
$
(201.3
)
Reclassified from AOCI(1)
6.0

 
0.2

 
—

 
6.2

Income taxes
 
 
 
 
 
 
 
Reclassified from AOCI(2)
(2.3
)
 
(0.1
)
 
—

 
(2.4
)
Total income taxes
(2.3
)
 
(0.1
)
 
—

 
(2.4
)
Net other comprehensive income
3.7

 
0.1

 
—

 
3.8

AOCI at end of period
$
(175.2
)
 
$
(22.4
)
 
$
0.1

 
$
(197.5
)

(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.
(3) Commodity cash flow hedge amounts are included in their entirety as an increase in Questar Pipeline revenue on the Consolidated Statements of Income.
(4) Income tax reclassifications related to commodity cash flow hedge amounts are included in their entirety as charges to income taxes on the Consolidated Statements of Income.