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Commitments, Guarantees and Contingencies - Coal, Rail and Shipping Contracts (Details) (Coal and Transportation [Member], USD $) In Millions, unless otherwise specified | Jun. 30, 2012
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Coal and Transportation [Member] |
Coal, Rail and Shipping Contracts [Line Items] |
Minimum Annual Payment Obligation, Current Year | $ 29.9
Minimum Annual Payment Obligation, Year Two | $ 24.5

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