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Commitments and Contingencies, Environmental (Details) - Jun. 30, 2015 - USD ($) $ in Millions | Total
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Environmental Contingency |
Environmental accrual | $ 19.5
Expected period related to remediation expenditures for environmental contingencies period | 30 years
Potential increase in environmental costs | $ 25.1
Minimum |
Environmental Contingency |
Period for final feasibility study | 18 months
Maximum |
Environmental Contingency |
Period for final feasibility study | 24 months

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