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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |
Environmental remediation liabilities - discounted | $ 38.7 | $ 39.2
Accrual for environmental loss contingencies - weighted-average discount rate | 3.50% |
Environmental remediation liabilities - undiscounted | $ 72.3 | 73.6
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 | 37.0 |
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Tax Indemnification Liability | $ 28.3 | $ 30.5

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