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Fair Value Amount of Derivative Assets Liabilities Offset in Regulatory Liabilities Assets (Detail) (Not Designated as Hedging Instrument, USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Derivative Assets
Derivative Assets	$ 0.1		$ 0.2
Derivative Liabilities
Derivative Liabilities	0.4	0.7	1.0
Natural Gas Contracts \| Other Noncurrent Assets
Derivative Assets
Derivative Assets	0.1		0.2
Natural Gas Contracts \| Other Current Liabilities
Derivative Liabilities
Derivative Liabilities	$ 0.4	$ 0.7	$ 1.0

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details