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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |  |
Environmental remediation liabilities - discounted | $ 24.5 | $ 22.8
Accrual for environmental loss contingencies - weighted-average discount rate | 3.60% |
Environmental remediation liabilities - undiscounted | $ 63.6 | 61.1
Potential revision on future environmental remediation costs before tax | 18.0 |
Tax indemnification liability | $ 42.8 | $ 38.2

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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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