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Financial Instruments Financial Instruments - Foreign Currency Exchange Rate Risk and Concentration of Credit Risk (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Entity | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |
Concentration Risk, Percentage | 99.00% |  |
Sales Revenue, Goods, Net [Member] |  |  |
Derivative [Line Items] |  |  |
Concentration Risk, Percentage | 23.00% | 23.70% | 27.20%
Number of customers | Entity | 3 |  |
Accounts Receivable [Member] |  |  |
Derivative [Line Items] |  |  |
Concentration Risk, Percentage | 5.50% | 6.20% |
Accumulated Translation Adjustment [Member] |  |  |
Derivative [Line Items] |  |  |
Foreign currency (losses) gains of net investment hedges included in accumulated other comprehensive loss | $ | $ 16.6 | $ (46.1) | $ 7.6

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- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82918529&loc=d3e30304-110892 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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