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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 29, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name ALTA EQUIPMENT GROUP INC.    
Entity Central Index Key 0001759824    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity File Number 001-38864    
Entity Incorporation State Country Code DE    
Entity Tax Identification Number 83-2583782    
Entity Address Address Line1 13211 Merriman Road    
Entity Address City or Town Livonia    
Entity Address State or Province MI    
Entity Address Postal Zip Code 48150    
City Area Code 248    
Local Phone Number 449-6700    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock Shares Outstanding   32,363,376  
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 265.2
Entity Well known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Auditor Firm ID 1195    
Auditor Name UHY    
Auditor Location New York, New York, United States    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant's proxy statement relating to the 2022 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common stock, $0.0001 par value per share    
Trading Symbol ALTG    
Security Exchange Name NYSE    
Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares    
Trading Symbol ALTG PRA    
Security Exchange Name NYSE