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Derivative Instruments and Hedging Activities
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments and Hedging Activities
Derivative Instruments and Hedging Activities
The Company is exposed to certain risks relating to its ongoing business operations.  The primary risk managed using derivatives instruments is interest rate risk. The Company is also exposed to credit risk in its business operations.
 
 Interest Rate Risk
 
The Company's exposure to changes in interest rates primarily relates to short-term variable-rate debt and commercial paper.  The Company manages its interest rate exposure by monitoring and limiting the effects of market changes in interest rates.  The Company may utilize interest rate derivatives to alter interest rate exposure in an attempt to reduce the effects of these changes.  Interest rate derivatives are used solely to modify interest rate exposure and not to modify the overall leverage of the debt portfolio.
Credit Risk
 
The Company is exposed to certain credit risks relating to its ongoing business operations. Credit risk includes the risk that counterparties who owe the Company money or energy will breach their obligations. If the counterparties to these arrangements fail to perform, the Company may be forced to enter into alternative arrangements. In that event, the Company's financial results could be adversely affected and the Company could incur losses.

Income Statement Presentation Related to Derivative Instruments
 
The Company had no derivative instruments included in its Consolidated Statements of Income in 2015 or 2014. The following tables present the effect of derivative instruments on the Company's Consolidated Statements 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
)