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Restructuring and Asset Impairment (Details) (Closure, USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
North River Mine
Asset impairment and restructuring
Gain on release of a below market contract liability	$ 17.0	$ 17.0
Asset impairment charges		8.0
Willow Creek Mine
Asset impairment and restructuring
Curtailment costs	$ 3.3	$ 10.7

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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