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Basic and Diluted Loss per Share - Schedule of Calculation of Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Earnings Per Share Basic And Diluted [Line Items]            
Net loss $ (2.1) $ (74.0) [1] $ (5.2) $ (8.2) $ (13.5) $ (79.2) [1]
Net loss attributable to noncontrolling interests (1.0) $ (1.0) [2]       $ (1.0) [2]
Net loss attributable to common shareholders (1.1)          
Class A Common Stock            
Earnings Per Share Basic And Diluted [Line Items]            
Net loss attributable to common shareholders $ (0.5)          
Denominator - Basic and Diluted:            
Weighted average common shares outstanding 19,002,563 19,002,563 [3]       19,002,563 [3]
Net loss per share - Basic and Diluted:            
Net loss per share - Basic and Diluted $ (0.03) $ (0.03) [3]       $ (0.03) [3]
Class C Common Stock            
Earnings Per Share Basic And Diluted [Line Items]            
Net loss attributable to common shareholders $ (0.6)          
Denominator - Basic and Diluted:            
Weighted average common shares outstanding 20,139,163 20,139,163 [3]       20,139,163 [3]
Net loss per share - Basic and Diluted:            
Net loss per share - Basic and Diluted $ (0.03) $ (0.03) [3]       $ (0.03) [3]
[1] Net loss attributable Shift4 Payments, Inc.is equal to comprehensive loss attributable to Shift4 Payments, Inc.
[2] Net loss attributable to noncontrolling interests is equal to comprehensive loss attributable to noncontrolling interests.
[3] Represents basic and diluted loss per share of Class A and Class C common stock and weighted average shares of Class A and Class C common stock outstanding for the period from June 5, 2020 through June 30, 2020, the period following the Reorganization Transactions and Shift4 Payments, Inc.'s initial public offering described in Note 1. See Note 22 for additional information on basic and diluted loss per share.