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Acquisitions and Other Investments - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	4 Months Ended	6 Months Ended	8 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Less:
Goodwill	$ 3,015.7	$ 3,006.2	$ 3,006.2	$ 3,006.2	$ 3,015.7
Payzer
Business Acquisition [Line Items]
Cash consideration transferred, net in cash and restricted cash acquired		244.0			244.0
Less:
Accounts receivable	2.4	2.4	2.4	2.4	2.4
Other current and long-term assets	1.4	1.4	1.4	1.4	1.4
Accrued expenses and other current liabilities	(1.8)	(1.8)	(1.8)	(1.8)	(1.8)
Measurement Period Adjustments, deferred tax liability		3.0
Deferred tax liability	(6.5)	(3.5)	(3.5)	(3.5)	(6.5)
Contingent/deferred consideration	(7.1)	(7.1)	(7.1)	(7.1)	(7.1)
Other liabilities	(0.9)	(0.9)	(0.9)	(0.9)	(0.9)
Measurement Period Adjustments, goodwill		(3.0)
Goodwill	193.0	190.0	190.0	190.0	193.0
Cash acquired from acquisition			$ 4.5
Weighted average life (in years)			3 years 10 months 24 days
Payzer | Customer relationships
Less:
Intangible assets	40.4	40.4	$ 40.4	40.4	40.4
Weighted average life (in years)			4 years 8 months 12 days
Payzer | Developed technology
Less:
Intangible assets	17.2	17.2	$ 17.2	17.2	17.2
Weighted average life (in years)			2 years 4 months 24 days
Payzer | Strategic partner relationships
Less:
Intangible assets	4.5	4.5	$ 4.5	4.5	4.5
Weighted average life (in years)			2 years 6 months
Payzer | Trademarks
Less:
Intangible assets	1.4	1.4	$ 1.4	1.4	1.4
Weighted average life (in years)			2 years 9 months 18 days
Ascensus Acquired Entities
Business Acquisition [Line Items]
Cash consideration transferred, net in cash and restricted cash acquired	158.0	158.9
Measurement period adjustments, cash consideration		0.9
Less:
Accounts receivable	7.3	7.3	$ 7.3	7.3	7.3
Other assets	3.8	3.8	3.8	3.8	3.8
Accrued expenses and other current liabilities	(6.5)	(6.5)	(6.5)	(6.5)	(6.5)
Restricted cash payable	(25.7)	(25.7)	(25.7)	(25.7)	(25.7)
Other liabilities	(2.7)	(2.7)	(2.7)	(2.7)	(2.7)
Measurement Period Adjustments, goodwill		0.9
Goodwill	85.9	86.8	86.8	86.8	85.9
Cash acquired from acquisition				$ 26.7
Weighted average life (in years)				4 years 4 months 24 days
Ascensus Acquired Entities | Customer relationships
Less:
Intangible assets	52.1	52.1	52.1	$ 52.1	52.1
Weighted average life (in years)				5 years 4 months 24 days
Ascensus Acquired Entities | Developed technology
Less:
Intangible assets	6.6	6.6	6.6	$ 6.6	6.6
Weighted average life (in years)				2 years 2 months 12 days
Ascensus Acquired Entities | Strategic partner relationships
Less:
Intangible assets	14.0	14.0	14.0	$ 14.0	14.0
Weighted average life (in years)				1 year 2 months 12 days
Ascensus Acquired Entities | Custodial Rights
Less:
Intangible assets	$ 23.2	$ 23.2	$ 23.2	$ 23.2	$ 23.2
Weighted average life (in years)				4 years 10 months 24 days

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