Goodwill and Other Identifiable Intangible Assets - Identifiable Intangible Assets (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Intangible Assets by Major Class [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	$ 0	$ 8,800,000
Finite-life intangibles, cost	460,400,000	433,700,000
Accumulated amortization	(294,600,000)	(316,700,000)
Finite-life intangibles, net	165,800,000	117,000,000.0
Indefinite-life intangibles	173,400,000	159,300,000
Total intangibles, cost	633,800,000	593,000,000.0
Total intangibles, net	339,200,000	276,300,000
Customer relationships
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	418,100,000	347,100,000
Accumulated amortization	(269,100,000)	(247,900,000)
Finite-life intangibles, net	149,000,000.0	99,200,000
Trade names
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	0	400,000
Accumulated amortization	0	(400,000)
Finite-life intangibles, net	0	0
Patented Technology [Member]
Acquired Intangible Assets by Major Class [Line Items]
Finite-life intangibles, cost	42,300,000	86,200,000
Accumulated amortization	(25,500,000)	(68,400,000)
Finite-life intangibles, net	$ 16,800,000	$ 17,800,000