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Cover - shares
 9 Months Ended
Sep. 30, 2021
Nov. 01, 2021
Class of Stock [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-39228  
Entity Registrant Name MULTIPLAN CORPORATION  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-3536151  
Entity Address, Address Line One 115 Fifth Avenue  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10003  
City Area Code 212  
Local Phone Number 780-2000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001793229  
Entity Common Stock, Shares Outstanding   638,276,295
Common Class A    
Class of Stock [Line Items]    
Title of 12(b) Security Shares of Class A common stock, $0.0001 par value per share  
Trading Symbol MPLN  
Security Exchange Name NYSE  
Warrants    
Class of Stock [Line Items]    
Title of 12(b) Security Warrants  
Trading Symbol MPLN.WS  
Security Exchange Name NYSE