Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 12, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
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		93,379,508
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 where indicated. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 2020.
ICFR Auditor Attestation Flag	false