Depreciation and Amortization - Schedule of Estimated Amortization Expense (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Amortization
2026 (remaining nine months)	$ 282.0
2027	313.0
2028	270.0
2029	216.0
2030	194.0
Thereafter	1,702.0
Total	2,977.0
Amortization of Acquired Intangible Assets
2026 (remaining nine months)	203.0
2027	225.0
2028	210.0
2029	198.0
2030	192.0
Thereafter	1,702.0
Total	2,730.0
Other Intangible Assets
Amortization
2026 (remaining nine months)	256.0
2027	282.0
2028	248.0
2029	204.0
2030	192.0
Thereafter	1,702.0
Total	2,884.0	$ 2,921.0
Capitalized Customer Acquisition Costs
Amortization
2026 (remaining nine months)	26.0
2027	31.0
2028	22.0
2029	12.0
2030	2.0
Thereafter	0.0
Total	$ 93.0	$ 89.0

Finite-Lived Intangible Asset, Expected Amortization, After Year Four

No definition available.

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

- Definition

Finite-Lived Intangible Assets Acquired, Amortization Expense, Fiscal Year Maturity

+ References

No definition available.

+ Details

Name:	four_FiniteLivedIntangibleAssetsAcquiredAmortizationExpenseFiscalYearMaturityAbstract
Namespace Prefix:	four_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization

+ References

No definition available.

+ Details

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

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization, After Year Four

+ References

No definition available.

+ Details

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

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization, Remainder Of Fiscal Year

+ References

No definition available.

+ Details

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

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization, Year Four

+ References

No definition available.

+ Details

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

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization, Year One

+ References

No definition available.

+ Details

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

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization, Year Three

+ References

No definition available.

+ Details

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

- Definition

Finite-Lived Intangible Assets Acquired, Expected Amortization, Year Two

+ References

No definition available.

+ Details

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

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-SubTopic 30
-Topic 350
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483154/926-20-50-5

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Details

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