Capitalized Acquisition Costs, Net - Summary of Estimate Future Amortization Expense for Capitalized Acquisition Costs (Details) $ in Millions	Jun. 30, 2020 USD ($)
Capitalized Acquisition Costs Net [Abstract]
2020 (remaining six months)	$ 7.7
2021	12.6
2022	7.7
2023	1.3
Total	$ 29.3

Amortization expense for capitalized acquisition costs remainder of fiscal year.

No definition available.

Name:	four_AmortizationExpenseForCapitalizedAcquisitionCostsRemainderOfFiscalYear
Namespace Prefix:	four_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant