Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 11, 2020
Document And Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Registrant Name	MultiPlan Corporation
Entity Central Index Key	0001793229
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Shares of Class A common stock
Trading Symbol	MPLN
Security Exchange Name	NYSE
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		667,461,272