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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Mar. 03, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
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 false    
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   32,859,690  
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] true    
Entity Public Float     $ 215.6
Entity Well known Seasoned Issuer No    
Entity Voluntary Filers No    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Detroit, Michigan    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant's proxy statement relating to the 2025 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Alta Equipment Group Inc. and subsidiaries (the "Company") as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive (loss) income, stockholders' equity, and cash flows, for the years ended December 31, 2024, and the related notes, and the schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 5, 2025, expressed an unqualified opinion on the Company's internal control over financial reporting.

   
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