Goodwill and Other Identifiable Intangible Assets - Identifiable Intangible Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Acquired Intangible Assets by Major Class [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	$ 8,800,000	$ 0	$ 0
Finite-life intangibles, cost	433,700,000	479,400,000
Accumulated amortization	(316,700,000)	(320,600,000)
Finite-life intangibles, net	117,000,000	158,800,000
Indefinite-life intangibles	159,300,000	163,000,000
Total intangibles, cost	593,000,000	642,400,000
Total intangibles, net	276,300,000	321,800,000
Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	347,100,000	360,900,000
Accumulated amortization	(247,900,000)	(229,900,000)
Finite-life intangibles, net	99,200,000	131,000,000
Trade names
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	400,000	1,500,000
Accumulated amortization	(400,000)	(1,400,000)
Finite-life intangibles, net	0	100,000
Patented Technology [Member]
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	86,200,000	117,000,000
Accumulated amortization	(68,400,000)	(89,300,000)
Finite-life intangibles, net	$ 17,800,000	$ 27,700,000