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Summary of Significant Accounting Policies - Additional information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) reportable_operating_segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts | $ 41.8 | $ 32.8 |
Inventory reserves | 109.2 | 94.4 |
Capitalized pre-production E&D costs | 257.4 | 179.3 |
Capitalized pre-production tooling costs related to customer-owned tools | 115.4 | 96.0 |
Cash collected related to E&D and tooling costs | 311.1 | 264.6 |
Depreciation expense | 380.1 | 325.2 | $ 295.3
Capital expenditures recorded in accounts payable | 119.7 | 117.8 | 91.6
Intangible assets fully amortized | 17.0 |  |
Restructuring charges | 70.9 | 63.6 | 81.1
Fixed asset impairment charges | 2.1 | 0.7 | 1.8
Engineering and development costs | 147.9 | 143.7 | 126.8
Foreign currency transaction gain (loss) | $ (5.1) | (7.6) | (28.5)
Number of reportable operating segments | reportable_operating_segment | 2 |  |
Asset impairments |  |  |
Significant Accounting Policies [Line Items] |  |  |
Restructuring charges | $ 1.3 | $ 4.7 | $ 3.9

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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