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Contingencies Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Sep. 30, 2011
Jun. 30, 2015
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 $ 3.0   $ 3.1  
Loss Contingency, Range of Possible Loss, Minimum 0.0   0.0  
Loss Contingency, Range of Possible Loss, Maximum $ 3.1   $ 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