Restructuring, Asset Impairment, and Transition Expenses - Summary of Reconciliation of Restructuring Expense by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 5.2	$ 3.0	$ 7.4
Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	5.2	3.0	7.4
Operating Segments [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	4.0	1.8	4.7
Operating Segments [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	1.2	1.2	2.7
2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	0.0	0.0	0.5
2017 Altra Plan [Member] | Operating Segments [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense			0.5
2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	5.2	3.0	6.9
2019 Altra Plan [Member] | Operating Segments [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	4.0	1.8	4.2
2019 Altra Plan [Member] | Operating Segments [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 1.2	$ 1.2	$ 2.7