Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 13, 2020
Document and Entity Information
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Entity Registrant Name	Acamar Partners Acquisition Corp.
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Central Index Key	0001759008
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Units, each of one share of Class A common stock and one-third of one redeemable warrant
Document and Entity Information
Title of 12(b) Security	Units, each consisting of one share of Class A common stock and one-third of one redeemable warrant
Trading Symbol	ACAMU
Security Exchange Name	NASDAQ
Class A Common Stock
Document and Entity Information
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	ACAM
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		30,557,322
Redeemable warrants, exercisable for Class A common stock
Document and Entity Information
Title of 12(b) Security	Redeemable warrants, exercisable for Class A common stock at an exercise price of $11.50 per share
Trading Symbol	ACAMW
Security Exchange Name	NASDAQ
Class B Common Stock
Document and Entity Information
Entity Common Stock, Shares Outstanding		7,639,330