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Summary of Significant Accounting Policies - Pending Merger with Global Inc. (Details) - USD ($)
May 27, 2019
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Common stock, par value (in dollars per share)   $ 0.10 $ 0.10
Global Payments, Inc.      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Equity value of shares $ 48    
Interest acquired (as a percent) 52.00%    
Global Payments, Inc. | Total Systems Services, Inc.      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Number of shares received 0.8101