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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Balance Sheet Presentation Related to Derivative Instruments

The Company had no material derivative instruments included in its Condensed Consolidated Balance Sheet at June 30, 2013. The fair value of the derivative instruments that are presented in the Company's Condensed 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 4 for a reconciliation of the Company's total derivatives fair value to the Company's Condensed Consolidated Balance Sheet at December 31, 2012.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
Income Statement Presentation Related to Derivative Instruments
 
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
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) into Income


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

$
—

Interest Rate Swap
—

(0.1
)
—

Total
$
(0.5
)
$
(0.1
)
$
—


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 six months ended June 30, 2012.

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
Natural Gas Financial Futures/Swaps
$
(0.2
)
$
5.2

$
—

Interest Rate Swap
—

(0.2
)
—

Total
$
(0.2
)
$
5.0

$
—


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
)