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Divestitures and Held for Sale - Summary of Amounts Included in Discontinued Operations (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gain on sale of discontinued operations | $ 462.0 | $ 462.0
Accounting Standards Update 2014-09 [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Amount reclassified from cost of sales to net sales | $ 14.0 | $ 23.3

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