Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	May 06, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Entity File Number	001-38136
Entity Registrant Name	Accel Entertainment, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1350261
Entity Address, Address Line One	140 Tower Drive
Entity Address, City or Town	Burr Ridge
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60527
City Area Code	630
Local Phone Number	972-2235
Title of 12(b) Security	Class A-1 Common Stock, par value $.0001 per share
Trading Symbol	ACEL
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 332.2
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001698991
Entity Common Stock, Shares Outstanding		93,389,821
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K, as amended, where indicated. Such Proxy Statement was filed with the Securities and Exchange Commission on March 24, 2021.
ICFR Auditor Attestation Flag	false
Amendment Description	The purpose of this Amendment is to restate the Company's previously issued consolidated financial statements and related financial information. The restatement relates to consideration of the factors in determining whether to classify contracts that may be settled in an entity’s own stock as equity of the entity or as an asset or liability. On April 12, 2021, the Acting Director of the Division of Corporation Finance and Acting Chief Accountant of the SEC together issued a statement regarding the accounting and reporting considerations for warrants issued by special purpose acquisition companies entitled “Staff Statement on Accounting and Reporting Considerations for Warrants Issued by Special Purpose Acquisition Companies (“SPACs”) (the “SEC Statement”). Specifically, the SEC Statement focused in part on (i) certain provisions in warrant agreements that provide for potential changes to the settlement amounts dependent upon the characteristics of the warrant holder, and because the holder of a warrant is not an input into the pricing of a fixed-for-fixed option on equity shares, such provisions would preclude the warrants from being classified as equity and thus the warrants should be classified as liabilities, and (ii) certain settlement terms and provisions in warrant agreements related to certain tender offers made to and accepted by holders of more than 50% of the outstanding shares preclude the warrants from being accounted for as a component of equity. The provisions in the warrant agreements addressed in the SEC Statement are similar to those contained in the warrant agreements governing the Company’s public warrants and private placement warrants (collectively, the “Warrants”).