Acquisitions and Dispositions - Acquired Entities (Details) - USD ($) $ in Millions			9 Months Ended		12 Months Ended
	Oct. 03, 2022	Jan. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jul. 18, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Restricted cash			$ 387.0		$ 387.0	$ 438.5
Goodwill			1,448.1		1,448.1	1,450.9
Contingent consideration payment			10.5	$ 2.8
NoteMachine
Business Acquisition [Line Items]
Acquisition date	Oct. 03, 2022
Percentage of shares acquired	100.00%
Annual revenues							$ 150.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Purchase consideration - cash paid					179.4
Contingent consideration	$ 14.8
Fair value of purchase consideration	194.2
Cash	6.8
Restricted cash	12.1
Accounts receivable	27.3
Other current assets	14.5
Property and equipment, net	38.2
Intangible assets	84.2
Goodwill	64.2
Other noncurrent assets	11.1
Current liabilities	(37.0)
Noncurrent liabilities	(27.2)
Fair value of net assets acquired	194.2
NoteMachine | Post-Acquisition Collection of ATM Tax Rate Rebates
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Contingent consideration	10.5
Contingent consideration payment			9.7
NoteMachine | ATM Cash Withdrawal Interchange Fees
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Contingent consideration	$ 4.3
Contingent consideration derecognition gain			4.8
NoteMachine | Europe
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill			63.0		63.0
NoteMachine | North America
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill			1.0		$ 1.0
NoteMachine | Customer relationships
Business Acquisition [Line Items]
Remaining Amortization Period	13 years
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 47.0
NoteMachine | Developed technology
Business Acquisition [Line Items]
Remaining Amortization Period	12 years
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 27.0
NoteMachine | Trade names
Business Acquisition [Line Items]
Remaining Amortization Period	5 years
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets	$ 10.0
Touchpoint 21 LLC
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Fair value of purchase consideration		$ 15.0
Maco
Business Acquisition [Line Items]
Percentage of shares acquired								100.00%
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Severance costs			$ 4.7			$ 12.5