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Settlement with Patriot Coal (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Subsequent Event [Line Items]
Payments for Legal Settlements	$ 15.6
Purchase commitment, remaining minimum amount committed	16.0
Letters of credit posted in the Companys favor	16.7
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments for Legal Settlements	$ 5.0

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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