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Noncontrolling Interests - Additional Information (Details) - shares
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Oct. 06, 2020
Sep. 15, 2020
Jun. 09, 2020
Jun. 04, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2020
Minority Interest [Line Items]                
Common stock issued and sold             2,000,000  
Shift4 Payments, Inc                
Minority Interest [Line Items]                
Common stock issued and sold             2,000,000  
Shift4 Payments, Inc | Subsequent Event                
Minority Interest [Line Items]                
Percentage of ownership interest after the purchase of remaining shares 56.40%              
Continuing Equity Owners | Subsequent Event                
Minority Interest [Line Items]                
Percentage of ownership interest after the purchase of remaining shares 43.60%              
Class A Common Stock                
Minority Interest [Line Items]                
Stock issue description               one-for-one
Common stock issued and sold         17,250,000      
Class A Common Stock | Searchlight Capital Partners, L.P.                
Minority Interest [Line Items]                
Stock exchange           7,856,373    
Class A Common Stock | Follow-on Offering                
Minority Interest [Line Items]                
Common stock issued and sold   2,000,000       2,000,000    
Class A Common Stock | Follow-on Offering | Searchlight Capital Partners, L.P.                
Minority Interest [Line Items]                
Common stock issued and sold   7,856,373            
Class A Common Stock | Follow-on Offering | Searchlight And Former Equity Owner                
Minority Interest [Line Items]                
Common stock issued and sold   8,000,000            
Class A Common Stock | Underwriters Option                
Minority Interest [Line Items]                
Common stock issued and sold     2,250,000 2,250,000        
Class A Common Stock | Underwriters Option | Searchlight Capital Partners, L.P. | Subsequent Event                
Minority Interest [Line Items]                
Common stock issued and sold 1,473,070              
Class A Common Stock | Underwriters Option | Searchlight And Former Equity Owner | Subsequent Event                
Minority Interest [Line Items]                
Common stock issued and sold 1,500,000              
Class B Common Stock | Searchlight Capital Partners, L.P.                
Minority Interest [Line Items]                
Stock exchange   3,637,501       (3,637,501)    
Class B Common Stock | Searchlight Capital Partners, L.P. | Subsequent Event                
Minority Interest [Line Items]                
Stock exchange 682,031