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				6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		$ 400.8		$ 466.5		$ 835.0	$ 949.3
Income/(loss) from operations		52.1		57.1		(45.9)	123.5
Restructuring costs		(1.5)	$ (1.6)	(3.2)	$ (2.3)	(3.1)	(5.5)
Net interest expense		18.8		18.6		36.2	38.4
Other non-operating expense, net		2.5		0.4		1.1	1.5
Total other non-operating (income) expense, net		21.3		19.0		37.3	39.9
(Loss)/Income before income taxes		30.8		38.1		(83.2)	83.6
Provision for income taxes		9.1		9.1		11.8	19.4
Net (loss)/income		21.7		29.0		(95.0)	64.2
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Restructuring costs		(1.5)		(3.2)		(3.1)	(5.5)
Operating Segments [Member] | Power Transmission Technologies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		196.3		234.9		413.0	469.8
Income/(loss) from operations		23.9		31.9		49.5	60.8
Restructuring costs						(1.1)	(2.9)
Operating Segments [Member] | Automation & Specialty [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		205.8		233.3		424.4	482.4
Income/(loss) from operations		26.0		31.8		(92.6)	72.4
Restructuring costs						(2.0)	(2.6)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		(1.3)		(1.7)		(2.4)	(2.9)
Corporate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Income/(loss) from operations	[1]	$ 3.7		$ (3.4)		$ 0.3	$ (4.2)

[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.