Union Pension Plan (Tables)

12 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Summary of Multiple Employer Pension Plans

Multiple Employer Pension Plans:

Pension Fund	EIN	Pension Protection Act Zone Status & Plan Year- End		FIP/RP Status	Contributions of Alta Equipment Group Inc. and Subsidiaries						Surcharge Imposed	Expiration Date of Collective- Bargaining Agreement
		2024	2023		2024		2023		2022
Midwest Operating Engineers  Local Union No. 150 Pension Trust Fund	36-6140097	Green 3/31/2024	Green 3/31/2023	None	$	3.0	$	2.8	$	2.4	No	5/31/2027
Operating Engineers Local  Union No. 324 Pension Fund	38-1900637	Red 4/30/2024	Red 4/30/2023	Implemented		1.7		1.6		1.2	Yes	9/30/2027
All Other Multiemployer Pension Plans (1)						1.7		1.5		1.2		Various
					$	6.4	$	5.9	$	4.8

(1) All Other Multiemployer Pension Plans includes 13 plans, none of which are individually significant when considering contributions to the plan, severity of the underfunded status, or other factors.