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SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Employee termination benefits obligations	$ 3.6		$ 14.5
Charges for employee termination benefits	$ 0.0	$ 25.2
Share-based compensation expense associated with equity awards held by terminated employees		$ 0.5

X

- Definition

Employee Termination Benefits Obligation

+ References

No definition available.

+ Details

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Namespace Prefix:	gpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount of expense for employee benefit and equity-based compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of noncash expense (reversal of expense) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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