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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments And Contingencies Disclosure [Line Items] |  |  |
Environmental remediation liabilities- discounted | $ 40.4 | $ 28.1 |
Accrual for environmental loss contingencies- weighted-average discount rate | 3.70% | 3.60% |
Environmental remediation liabilities- undiscounted | $ 74.5 | $ 68.2 |
Rental expense | 37.6 | $ 31.2 | $ 31.4
Discontinued operations |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rental expense |  |  | $ 11.8
Minimum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Potential revision on future environmental remediation costs before tax | 10.0 |  |
Maximum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Potential revision on future environmental remediation costs before tax | 35.0 |  |
2014 Sales Contract | Other expenses, net |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Legal accrual | 16.2 |  |
Guarantee From Previously Disposed Business | Other expenses, net |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Legal accrual | $ 10.8 |  |

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- Definition Accrual For Environmental Loss Contingencies Undiscounted For Accruals Qualifying For Discounting + References No definition available. + Details
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- Definition Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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