Divestitures and Held for Sale - Summary of Amounts Included in Discontinued Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations	$ 27.5	$ 489.0
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 product sold to net sales	$ 16.0	$ 39.3

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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