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Commitments and Contingencies - Roll forward of Asbestos Liability and Related Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Changes in estimate during the period: |  |
Asbestos-related liability | $ 77.1 | $ 76.8
Asbestos-related current assets | 64.7 | 66.0
Noncurrent portion | 800.1 | 877.5
Noncurrent Asbestos Related Assets | 304.0 | 314.6
Asbestos Related Matters [Member] |  |
Liability for Asbestos and Environmental Claims, Net [Roll Forward] |  |
Net Balance, Beginning | 573.7 | 630.8
Changes in estimate during the period: |  |
Continuing operations | (56.5) | (59.0)
Asbestos remeasurement | (76.4) | (81.8)
Settlement Agreement | 0.0 | 2.1
Change in Defense Cost Estimate for Asbestos Matters | 0.0 | 4.9
Net cash activity | (45.3) | (31.5)
Balance, Ending |  | 573.7
Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties | 508.5 | 573.7
Asbestos Related Matters [Member] | Liability [Member] |  |
Liability for Asbestos and Environmental Claims, Net [Roll Forward] |  |
Balance, Beginning | 954.3 | 1,042.8
Changes in estimate during the period: |  |
Continuing operations | (67.1) | (68.8)
Asbestos remeasurement | (66.4) | (75.9)
Settlement Agreement | 0.0 |
Change in Defense Cost Estimate for Asbestos Matters | 0.0 | 4.9
Net cash activity | (77.8) | (76.5)
Balance, Ending | 877.2 | 954.3
Noncurrent portion |  | 877.5
Asbestos Related Matters [Member] | Asset [Member] |  |
Liability for Asbestos and Environmental Claims, Net [Roll Forward] |  |
Balance, Beginning | 380.6 | 412.0
Changes in estimate during the period: |  |
Continuing operations | 10.6 | 9.8
Asbestos remeasurement | (10.0) | (5.9)
Settlement Agreement | 0.0 | 2.1
Change in Defense Cost Estimate for Asbestos Matters | 0.0 | 0.0
Net cash activity | 32.5 | 45.0
Balance, Ending | $ 368.7 | $ 380.6

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- Definition Asbestos Asset Gross Current and Non-current Beginning Balance + References No definition available. + Details
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- Definition Asbestos Asset Gross Current and Non-current Ending Balance + References No definition available. + Details
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- Definition Asbestos Liability and Related Assets Net Current and Noncurrent + References No definition available. + Details
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- Definition Asbestos Liability Gross Current and Non-current Beginning Balance + References No definition available. + Details
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- Definition Asbestos Liability Gross Current and Non-current Ending Balance + References No definition available. + Details
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- Definition Asbestos-related assets include both the probable insurance recoveries for the asbestos liabilities for pending claims, as well as unasserted claims to be filed over the next 10 years. + References No definition available. + Details
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- Definition Asbestos Related Costs Provision Before Tax + References No definition available. + Details
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- Definition Asbestos Related Costs Settlement Before Tax + References No definition available. + Details
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- Definition Asbestos-related current assets. + References No definition available. + Details
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- Definition Asbestos related liability current. + References No definition available. + Details
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- Definition Asbestos Related Remeasurement Costs Before Tax + References No definition available. + Details
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- Definition Change in Defense Cost Estimate for Asbestos Matters + References No definition available. + Details
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- Definition Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties. + References No definition available. + Details
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- Definition The payments made in the period which reduced asbestos loss contingency reserves, net of associated insurance reimbursements. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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