The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

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Contingencies Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2011	Nov. 30, 2011
Loss Contingencies [Line Items]
Estimate of EPA's interim removal project costs				$ 0.5
Patent Infringement Against Orbis Corp. [Member]
Loss Contingencies [Line Items]
Range of possible loss, minimum		0
Range of possible loss, maximum		3.1
Provision	3.1	3.0
Pending Litigation [Member] \| Environmental Issue [Member] \| General and Administrative Expense [Member] \| New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Expense related to remedial investigation and feasibility study			1.9
Other Liabilities [Member] \| Pending Litigation [Member] \| Environmental Issue [Member] \| New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Expenses incurred and charged against reserve			$ 0.8