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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments And Contingencies Disclosure [Line Items] |  |  |
Environmental remediation liabilities- discounted | $ 28.1 | $ 22.8 |
Accrual for environmental loss contingencies- weighted-average discount rate | 3.60% | 3.50% |
Environmental remediation liabilities- undiscounted | $ 68.2 | $ 61.1 |
Potential revision on future environmental remediation costs before tax | 18.0 |  |
Rental expense | $ 31.2 | 31.4 | $ 34.8
Discontinued operations |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rental expense |  | $ 11.8 | $ 10.2

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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