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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Millions			5 Months Ended	7 Months Ended	12 Months Ended
	Oct. 01, 2023 reporting_unit	Aug. 11, 2023 reporting_unit	Dec. 31, 2023 USD ($)	Aug. 12, 2023 USD ($) reporting_unit	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Goodwill [Line Items]
Number of reporting units \| reporting_unit	2	2		4
Amortization \| $			$ 42.8	$ 59.0	$ 96.2	$ 102.7
Minimum \| Capitalized software development
Goodwill [Line Items]
Estimated useful lives			3 years
Maximum \| Capitalized software development
Goodwill [Line Items]
Estimated useful lives			5 years
Global Banking
Goodwill [Line Items]
Fair value in excess of carrying value, percentage			43.00%
Global Retail
Goodwill [Line Items]
Fair value in excess of carrying value, percentage			34.00%