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Realignment Costs - Additional Information (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 43.9
Reduction In Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring charges	43.9
Effect on net income (loss)	$ (33.6)
Effect on earnings per Share diluted (in usd per share) | $ / shares	$ (0.15)
Electronic Instruments Group | Reduction In Workforce | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 22.8
Electromechanical Group | Reduction In Workforce | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20.9
Cost of Sales, Excluding Depreciation | Reduction In Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring charges	43.7
Selling, General and Administrative Expenses | Reduction In Workforce
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.2

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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