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, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		$ 434.2	$ 482.8
Income from operations		(98.0)	66.4
Restructuring costs		(1.6)	(2.3)
Net interest expense		17.4	19.8
Other non-operating (income), net		(1.5)	1.1
Total other non-operating (income) expense, net		15.9	20.9
(Loss)/Income before income taxes		(113.9)	45.5
Provision for income taxes		2.7	10.3
Net (loss)/income		(116.6)	35.2
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Restructuring costs		(1.6)	(2.3)
Operating Segments [Member] | Power Transmission Technologies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		216.7	234.9
Income from operations		25.7	28.9
Restructuring costs		(0.6)
Operating Segments [Member] | Automation & Specialty [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		218.6	249.1
Income from operations		(118.7)	40.6
Restructuring costs		(1.0)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		(1.1)	(1.2)
Corporate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Income from operations	[1]	$ (3.4)	$ (0.8)

[1] Certain expenses are maintained at the corporate level and not allocated to the segments. These include various administrative expenses related to the Company’s corporate headquarters, depreciation on capitalized software costs, non-capitalizable software implementation costs and acquisition related expenses.