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Other Intangible Assets, Net - Schedule of Other Intangible Assets, Net (Parenthetical) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Residual Commission Buyouts
Finite Lived Intangible Assets [Line Items]
Contingent payment	$ 2.8	$ 2.7

X

- Definition

Contingent payments.

+ References

No definition available.

+ Details

Name:	four_ContingentPayments
Namespace Prefix:	four_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=four_ResidualCommissionBuyoutsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: