Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Nov. 30, 2021	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Gain (loss) in AOCIL					$ 31.2	$ 19.8
Cross Currency Interest Rate Swap [Member]
Derivative [Line Items]
Proceeds from cross-currency interest rate swaps upon termination				$ 56.2
Paid termination fees				0.9
Gain (loss) in AOCIL				44.8	31.2	19.8
AOCIL tax expense (benefit)				11.4	9.9	3.6
Cross Currency Interest Rate Swap [Member] | Interest Income [Member]
Derivative [Line Items]
Cumulative translation adjustment recognized net interest income (expense), net amount				3.3
Interest Rate Swap [Member]
Derivative [Line Items]
Paid termination fees			$ 0.1
Gain (loss) in AOCIL				(11.9)		(9.9)
AOCIL tax expense (benefit)				3.8		1.7
Maturity date of interest rate swap	Jan. 31, 2020
Fair value of swap			34.7
Net interest expense			$ 0.1		11.5	$ 3.3
Non cash interest expense related to termination of interest rate swap					9.0
Non cash interest expense net of tax related to termination of interest rate swap					$ 6.9
Interest Rate Swap [Member] | Altra Credit Agreement [Member]
Derivative [Line Items]
Non-cash interest expense from AOCIL to earnings				25.7
Non-cash interest expense, net of tax from AOCIL to earnings				$ 21.5
Interest Rate Swap [Member] | Interest Expense [Member] | Altra Credit Agreement [Member]
Derivative [Line Items]
Unrealized loss in AOCIL		$ 14.9