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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
At December 31, 2012, the Company had the following derivative instruments that were designated as cash flow hedges.
(In millions)
2012 Gross Notional Volume (A)
Enogex hedges
 
Natural gas sales
3.7

(A)
Natural gas in MMBtu's.

At December 31, 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)
7.0

30.1

Fixed Swaps/Futures
16.2

17.9

Basis Swaps
7.3

6.7

(A)
Natural gas in MMBtu's.  
(B)
95.1 percent of the natural gas contracts have durations of one year or less, 2.9 percent have durations of more than one year and less than two years and 2.0 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]

Balance Sheet Presentation Related to Derivative Instruments

The fair value of the derivative instruments that are presented in the Company's Consolidated Balance Sheet at December 31, 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
$
0.1

$
—

 
Other Current Assets
5.0

4.7

Physical Purchases/Sales
Current PRM
0.4

0.3

Total
$
5.5

$
5.0

Total Gross Derivatives (A)
$
5.5

$
5.5

(A)
See Note 6 for a reconciliation of the Company's total derivatives fair value to the Company's Consolidated Balance Sheet at December 31, 2012.

The fair value of the derivative instruments that are presented in the Company's 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 6 for a reconciliation of the Company's total derivatives fair value to the Company's 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 Consolidated Statement of Income in 2012.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income (A)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) into Income


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

$
5.2

$
—

Interest Rate Swap
—

(0.4
)
—

Total
$
0.5

$
4.8

$
—

(A)
The estimated net amount of gains or losses included in Accumulated Other Comprehensive Income (Loss) at December 31, 2012 that is expected to be reclassified into income within the next 12 months is a loss of $0.2 million.

Derivatives Not Designated as Hedging Instruments

(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(11.7
)
Natural Gas Financial Futures/Swaps
1.1

Total
$
(10.6
)
     
The following tables present the effect of derivative instruments on the Company's Consolidated Statement of Income in 2011.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) into Income


Amount Recognized in Income
NGLs Financial Options
$
(8.4
)
$
(9.8
)
$
—

Natural Gas Financial Futures/Swaps
2.9

(30.4
)
—

Interest Rate Swap
—

(0.4
)
—

Total
$
(5.5
)
$
(40.6
)
$
—


Derivatives Not Designated as Hedging Instruments
(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(10.0
)
Natural Gas Financial Futures/Swaps
0.4

Total
$
(9.6
)
 
The following tables present the effect of derivative instruments on the Company's Consolidated Statement of Income in 2010.
 
Derivatives in Cash Flow Hedging Relationships
(In millions)
Amount Recognized in Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) into Income


Amount Recognized in Income
NGLs Financial Options
$
(9.7
)
$
1.2

$
—

NGLs Financial Futures/Swaps
1.7

(3.7
)
—

Natural Gas Financial Futures/Swaps
(14.9
)
(25.9
)
0.2

Interest Rate Swap
—

(0.4
)
—

Total
$
(22.9
)
$
(28.8
)
$
0.2


Derivatives Not Designated as Hedging Instruments
(In millions)
Amount Recognized in Income
Natural Gas Physical Purchases/Sales
$
(11.7
)
Natural Gas Financial Futures/Swaps
3.2

Total
$
(8.5
)