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Subsequent Event - Narrative (Detail) - GDS - Disposition by Sale - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Oct. 25, 2019
Subsequent Event [Line Items]
Net sales	$ 185.1	$ 207.2	$ 272.8
Net assets sold	$ 21.0
Subsequent Event
Subsequent Event [Line Items]
Cash on disposition of business				$ 42.3