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          
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          
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