Segments, Concentrations and Geographic Information - Segment Financial Information and Reconciliation of Segments Revenue to Unaudited Condensed Consolidated Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 511.7	$ 472.1
Income from operations	67.6	65.1
Restructuring costs	(0.4)	(0.9)
Net interest expense	11.3	16.9
Other non-operating income, net	(0.1)	(1.5)
Total other non-operating (income) expense, net	11.2	15.4
Income before income taxes	56.4	49.7
Provision for income taxes	11.6	10.5
Net income	44.8	39.2
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Restructuring costs	(0.4)	(0.9)
Operating Segments [Member] | Power Transmission Technologies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	253.7	221.0
Income from operations	32.3	27.8
Restructuring costs		(0.6)
Operating Segments [Member] | Automation & Specialty [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	259.2	252.1
Income from operations	35.6	41.4
Restructuring costs	(0.4)	(0.3)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	(1.2)	(1.0)
Corporate Expenses [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Income from operations	$ 0.1	$ (3.2)