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Commitments and Contingencies (Details) In Millions, unless otherwise specified | 9 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | Jun. 30, 2014 CAD | Jun. 30, 2013 USD ($) | Sep. 30, 2013 CAD | Jun. 30, 2014 Prior To 1995 [member] USD ($) | Jun. 30, 2014 From 2000 to 2005 [Member] USD ($) | Dec. 31, 2014 Subsequent Event [Member] USD ($)
Loss Contingency, Damages Sought, Value |  | 10.0 |  |  |  |  |
Damages arising due to alleged environmental contamination of the property and breach of lease |  |  |  | 10 |  |  |
Walter Energy tax assessment |  |  |  |  | 34.0 | 82.2 |
Walter Energy tax assessment prior to 1995 related to timing | 21.0 |  |  |  |  |  |
Amount payable pending completion of an IRS audit | 11.6 |  |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation | 1.0 |  |  |  |  |  |
Assets Held-for-sale, Property, Plant and Equipment | 0.8 |  |  |  |  |  |
Proceeds from Sale of Productive Assets | $ 1.2 |  | $ 0.1 |  |  |  | $ 3.5

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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