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Commitments and Contingencies (Details) - USD ($) $ in Millions	Mar. 01, 2016	Sep. 30, 2015	May 02, 2012
Nui Phao Mining Company
Loss Contingencies [Line Items]
Damages sought		$ 167.0
Judicial Council Of California - Unpaid Fees
Loss Contingencies [Line Items]
Litigation amount			$ 4.7
Judicial Council Of California, Disgorged Fees
Loss Contingencies [Line Items]
Litigation amount			$ 18.3
Pending Litigation | Motiva Enterprises LLC
Loss Contingencies [Line Items]
Damages sought	$ 8,000.0

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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