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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |
Environmental remediation liabilities - discounted | $ 38.6 | $ 40.4
Accrual for environmental loss contingencies - weighted-average discount rate | 3.70% | 3.70%
Environmental remediation liabilities - undiscounted | $ 72.1 | $ 74.5
Minimum |  |
Loss Contingencies [Line Items] |  |
Potential revision on future environmental remediation costs before tax | 10.0 |
Maximum |  |
Loss Contingencies [Line Items] |  |
Potential revision on future environmental remediation costs before tax | 30.0 |
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Tax Indemnification Liability | 29.0 | $ 45.3
Accrued expenses |  |
Loss Contingencies [Line Items] |  |
Tax Indemnification Liability | $ 21.4 |

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