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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Commitments And Contingencies Disclosure [Line Items] |  |
Environmental remediation liabilities - discounted | $ 25.0 | $ 24.5
Environmental remediation liabilities - undiscounted | 65.1 | $ 64.5
Potential revision on future environmental remediation costs before tax | $ 15.0 |
Minimum |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Accrual for environmental loss contingencies - discount rate | 2.80% |
Maximum |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Accrual for environmental loss contingencies - discount rate | 4.30% |

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