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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
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 2013.

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
)

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
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

$
—


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
)