Restructuring, Asset Impairment, and Transition Expenses - Reconciliation of Accrued Restructuring Costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 0.5	$ 2.3	$ 4.1
Restructuring expense incurred	5.2	3.0	7.4
Cash payments	(2.2)	(4.8)	(9.2)
Ending Balance	3.5	0.5	2.3
2017 Altra Plan [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0.5	1.5
Restructuring expense incurred	0.0	0.0	0.5
Cash payments		(0.5)	(1.5)
Ending Balance			0.5
2019 Altra Plan [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.5	1.8	2.6
Restructuring expense incurred	5.2	3.0	6.9
Cash payments	(2.2)	(4.3)	(7.7)
Ending Balance	$ 3.5	$ 0.5	$ 1.8