Restructuring, Asset Impairment, and Transition Expenses - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 3.0	$ 7.4	$ 14.1
Workforce Reductions [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	2.0	5.0	5.9
Consolidation and Relocation Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.8	0.6	1.5
Other Restructuring Expense [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.2	1.3	1.0
2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.0	0.5	5.7
2017 Altra Plan [Member] | Severance [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs			1.8
2017 Altra Plan [Member] | Consolidation Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs			1.5
2017 Altra Plan [Member] | Employee Relocation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs			1.5
2017 Altra Plan [Member] | Other Restructuring Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs			0.9
2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 3.0	$ 6.9	$ 8.4
Expected period to incur restructuring expense			2 years
2019 Altra Plan [Member] | Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Expected additional restructuring cost remaining			$ 1.0
2019 Altra Plan [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Expected additional restructuring cost remaining			$ 2.0