Goodwill and Intangible Assets - Acquired Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 996.7	$ 875.5
Accumulated Impairment Charges	(1.5)	(1.5)
Accumulated Amortization	(418.4)	(363.2)
Foreign Currency Translation	(0.8)	1.4
Intangible assets, net	576.0	512.2
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	556.4	446.4
Accumulated Impairment Charges	(0.1)	(0.1)
Accumulated Amortization	(241.7)	(209.8)
Foreign Currency Translation	(0.2)	(0.1)
Intangible assets, net	314.4	236.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	317.6	308.2
Accumulated Impairment Charges	(1.4)	(1.4)
Accumulated Amortization	(124.2)	(104.8)
Foreign Currency Translation	(0.2)	1.7
Intangible assets, net	191.8	203.7
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	122.7	120.9
Accumulated Amortization	(52.5)	(48.6)
Foreign Currency Translation	(0.4)	(0.2)
Intangible assets, net	$ 69.8	$ 72.1