Registration of securities issued in business combination transactions

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS (Details)

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DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS (Details) - USD ($)
 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2019
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2019
Apr. 10, 2019
Shares Issued, Price Per Share $ 10.00     $ 10.00 $ 10.00  
Proceeds from Issuance Initial Public Offering $ 690,000,000 $ 677,788,000 $ 0 $ 677,788,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 11.50 $ 11.50  
Proceeds from Issuance of Warrants   15,800,000 0 $ 15,800,000    
Transaction Cost Related To Issuance Of Common Stock 34,319,807          
Deferred Underwriting Fee Payable Non current     21,371,000 21,371,000 $ 21,371,000  
Underwriting Discount 12,212,000          
Deferred Underwriting Discount Payable Non current 21,371,000          
Other Offering Costs Related To Issuance Of Common Stock 736,807          
Cash   $ 2,223,724 $ 1,744,991 $ 2,238,275 $ 2,238,275 $ 0
Working Capital Requirement Fund Annual Limit $ 250,000          
Temporary Equity, Redemption Price Per Share $ 10.00          
Maximum Percentage Of Shares Eligible From Redemption 15.00%          
Dissolution Expenses Payable $ 100,000          
IPO [Member]            
Stock Issued During Period, Shares, New Issues 69,000,000       69,000,000  
Shares Issued, Price Per Share $ 10.00     $ 10.00 $ 10.00  
Proceeds from Issuance Initial Public Offering $ 690,000,000          
Transaction Cost Related To Issuance Of Common Stock 34,319,807          
Underwriting Fees 12,212,000          
Deferred Underwriting Fee Payable Non current 21,371,000          
Other Costs Related To Issuance Of Common Stock $ 736,807          
Cash       $ 2,238,275 $ 2,238,275  
Over-Allotment Option [Member]            
Stock Issued During Period, Shares, New Issues 9,000,000       9,000,000  
Shares Issued, Price Per Share $ 10.00          
Private Placement [Member]            
Number Of Warrants Issued 15,800,000       15,800,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.00     $ 1.00 $ 1.00  
Proceeds from Issuance of Warrants $ 15,800,000       $ 15,800,000  
Churchill Sponsor LLC [Member]            
Business Combination Aggregate Fair Market Value On Assets Held In Trust Percentage 80.00%          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 5,000,001