Other Intangible Assets Textuals (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill and Intangible Asset Impairment	$ 12.3
Amortization expense related to finite-lived intangible assets	$ 20.4	$ 20.8	$ 17.6
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	12 years 7 months 6 days
Proprietary technology
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	12 years 10 months 24 days
Patents and other
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	6 years