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Commitments and Contingencies Commitments and Contingencies - Environmental Textuals (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Environmental-related assets | $ 24.5 | $ 33.4 |
Discontinued Operations [Member] |  |  |
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Estimates | 3.7 | (0.7) |
Environmental Issue [Member] |  |  |
Gross Settlement with Insurance Provider for Environmental Matters |  |  | $ 34.2
Settlement Agreement with Insurer, Amount Received in Cash |  | 2.0 |
Settlement Agreement with Insurer, Amount Deposited in Qualified Settlement Fund |  | 32.2 |
Settlement Agreement with Insurer, Deferred Income |  | $ 23.0 |
Reduction to Environmental QSF Asset due to Settlement Agreement | 5.2 |  |
Recognition of Environmental QSF Deferred Gain due to Amendment | $ 3.8 |  |

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- Definition Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement. + References Reference 1: 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.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Recorded amount of the individual components comprising the asset for third-party recoveries related to environmental remediation obligations. + 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 + Details
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