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Contingencies - Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |
Balance beginning of period | $ 159.9 | $ 229.5
Additions | 94.6 | 29.2
Collections and settlements converted to notes receivable | (119.8) | (98.8)
Balance end of period | $ 134.7 | $ 159.9

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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
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- Definition Amount of cash inflow from the collection of receivables related to a loss contingency. + References No definition available. + Details
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- Definition Amount of additions to receivables pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12053-110248 + 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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