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 vs. Bechtel-Jacobs CEP Port Arthur Joint Venture
Loss Contingencies [Line Items]
Damages sought	$ 8,000.0