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Contingencies Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015	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
Loss Contingencies [Line Items]
Contingency accrual	3.1	3.0
Loss Contingency, Range of Possible Loss, Minimum	0
Loss Contingency, Range of Possible Loss, Maximum	3.1
General and Administrative Expense \| Environmental Issue \| Pending Litigation \| New Idria Mercury Mine
Loss Contingencies [Line Items]
Expense related to remedial investigation and feasibility study			1.9
Other Liabilities \| Environmental Issue \| Pending Litigation \| New Idria Mercury Mine
Loss Contingencies [Line Items]
Payments charged against the reserve			$ 0.9