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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
At June 30, 2012, the Company had the following derivative instruments that were designated as cash flow hedges.
(In millions)
2012 Gross Notional Volume (A)
Enogex marketing hedges
 
Natural gas sales
2.6

(A) Natural gas in MMBtu's.
 At June 30, 2012, the Company had the following derivative instruments that were not designated as hedging instruments.
(In millions)
Gross Notional Volume (A)
 
Purchases
Sales
Natural gas (B)
 
 
Physical (C)(D)
7.7

31.0

Fixed Swaps/Futures
57.9

59.7

Options
13.3

12.3

Basis Swaps
15.1

21.6

(A)
Natural gas in MMBtu's.  
(B)
96.9 percent of the natural gas contracts have durations of one year or less, 1.8 percent have durations of more than one year and less than two years and 1.3 percent have durations of more than two years.
(C)
Of the natural gas physical purchases and sales volumes not designated as hedges, the majority are priced based on a monthly or daily index and the fair value is subject to little or no market price risk.
(D)
Natural gas physical sales volumes exceed natural gas physical purchase volumes due to the marketing of natural gas volumes purchased via Enogex's processing contracts, which are not derivative instruments and are excluded from the table above.

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The fair value of the derivative instruments that are presented in the Company's Condensed Consolidated Balance Sheet at June 30, 2012 are as follows:
 
 
Fair Value
Instrument
Balance Sheet Location
Assets       
Liabilities
 
 
(In millions)
Derivatives Designated as Hedging Instruments 
 
 
 
Natural Gas
 
 
 
Financial Futures/Swaps
Other Current Assets
$
—

$
0.5

Total
$
—

$
0.5

 
 
 
 
Derivatives Not Designated as Hedging Instruments 
 
 
 
Natural Gas
 
 
 
Financial Futures/Swaps
Current PRM
$
0.2

$
0.1

 
Other Current Assets
16.5

17.4

Physical Purchases/Sales
Current PRM
0.8

0.4

 
Non-Current PRM
0.1

—

Financial Options                                       
Other Current Assets
0.5

0.5

Total
$
18.1

$
18.4

Total Gross Derivatives (A)
$
18.1

$
18.9

(A)
See Note 3 for a reconciliation of the Company's total derivatives fair value to the Company's Condensed Consolidated Balance Sheet at June 30, 2012.

The fair value of the derivative instruments that are presented in the Company's Condensed Consolidated Balance Sheet at December 31, 2011 are as follows:
 
 
Fair Value
Instrument
Balance Sheet Location
Assets       
Liabilities
 
 
(In millions)
Derivatives Designated as Hedging Instruments 
 
 
 
Natural Gas
 
 
 
Financial Futures/Swaps
Other Current Assets
$
5.2

$
0.3

Total
$
5.2

$
0.3

 
 
 
 
Derivatives Not Designated as Hedging Instruments 
 
 
 
Natural Gas
 
 
 
Financial Futures/Swaps
Current PRM
$
0.4

$
—

 
Other Current Assets
49.9

49.9

Physical Purchases/Sales
Current PRM
3.1

0.4

 
Non-Current PRM
0.3

0.1

Financial Options
Other Current Assets
2.4

2.8

Total
$
56.1

$
53.2

Total Gross Derivatives (A)
$
61.3

$
53.5

(A)
See Note 3 for a reconciliation of the Company's total derivatives fair value to the Company's Condensed Consolidated Balance Sheet at December 31, 2011.
       
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
 
The following tables present the effect of derivative instruments on the Company's Condensed Consolidated Statement of Income for the three months ended June 30, 2012.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income (A)
Amount Reclassified from Accumulated Other Comprehensive Income into Income


Amount Recognized in Income
Natural Gas Financial Futures/Swaps
$
(0.5
)
$
—

$
—

Total
$
(0.5
)
$
—

$
—

(A) The estimated net amount of gains or losses included in Accumulated Other Comprehensive Income at June 30, 2012 that is expected to be reclassified into income within the next 12 months is a loss of $0.5 million.

Derivatives Not Designated as Hedging Instruments

(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(3.7
)
Natural Gas Financial Futures/Swaps
0.6

Total
$
(3.1
)
     
The following tables present the effect of derivative instruments on the Company's Condensed Consolidated Statement of Income for the three months ended June 30, 2011.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income into Income


Amount Recognized in Income
NGLs Financial Options
$
(2.4
)
$
(3.3
)
$
—

Natural Gas Financial Futures/Swaps
0.1

(7.4
)
—

Total
$
(2.3
)
$
(10.7
)
$
—


Derivatives Not Designated as Hedging Instruments
(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(2.9
)
Natural Gas Financial Futures/Swaps
(0.2
)
Total
$
(3.1
)
 
The following tables present the effect of derivative instruments on the Company's Condensed Consolidated Statement of Income for the six months ended June 30, 2012.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income (A)
Amount Reclassified from Accumulated Other Comprehensive Income into Income


Amount Recognized in Income
Natural Gas Financial Futures/Swaps
$
(0.2
)
$
5.2

$
—

Total
$
(0.2
)
$
5.2

$
—

(A) The estimated net amount of gains or losses included in Accumulated Other Comprehensive Income at June 30, 2012 that is expected to be reclassified into income within the next 12 months is a loss of $0.5 million.

Derivatives Not Designated as Hedging Instruments

(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(6.1
)
Natural Gas Financial Futures/Swaps
1.0

Total
$
(5.1
)
     
The following tables present the effect of derivative instruments on the Company's Condensed Consolidated Statement of Income for the six months ended June 30, 2011.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income into Income


Amount Recognized in Income
NGLs Financial Options
$
(9.2
)
$
(5.8
)
$
—

Natural Gas Financial Futures/Swaps
(0.1
)
(14.7
)
—

Total
$
(9.3
)
$
(20.5
)
$
—


Derivatives Not Designated as Hedging Instruments
(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(5.0
)
Natural Gas Financial Futures/Swaps
(0.4
)
Total
$
(5.4
)