Segments - Segments Results (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Total consolidated revenues		$ 4,357.0	$ 4,475.5	$ 5,070.8
Operating income:
Total operating income		817.5	884.9	1,123.1
Operating Segments
Operating income:
Total operating income		847.0	924.4	1,123.1
Depreciation and amortization:
Total consolidated depreciation and amortization		183.6	183.8	208.2
Capital expenditures:
Total consolidated capital expenditures		147.8	208.2	214.6
Operating Segments | Consumer Money Transfer
Revenues:
Total consolidated revenues		4,005.0	3,993.5	4,394.0
Operating income:
Total operating income		750.8	765.1	977.6
Depreciation and amortization:
Total consolidated depreciation and amortization		173.7	176.6	181.6
Capital expenditures:
Total consolidated capital expenditures		136.6	198.8	192.3
Operating Segments | Business Solutions
Revenues:
Total consolidated revenues	[1]	29.7	196.9	421.8
Operating income:
Total operating income	[1]	3.7	58.5	95.5
Depreciation and amortization:
Total consolidated depreciation and amortization				16.1
Capital expenditures:
Total consolidated capital expenditures			0.2	5.2
Operating Segments | Consumer services
Revenues:
Total consolidated revenues		322.3	285.1	255.0
Operating income:
Total operating income		92.5	100.8	50.0
Depreciation and amortization:
Total consolidated depreciation and amortization		9.9	7.2	10.5
Capital expenditures:
Total consolidated capital expenditures		11.2	9.2	$ 17.1
Not Allocated To Segments
Operating income:
Operating expenses redeployment program costs	[2]	$ (29.5)	(21.8)
Not Allocated To Segments | Russia/Belarus
Operating income:
Exit costs	[3]		(10.0)
Not Allocated To Segments | Business Solutions
Operating income:
Exit costs	[3]		$ (7.7)

[1] On August 4, 2021, the Company entered into an agreement to sell its Business Solutions business to the Buyer. The sale was completed in three closings, the first of which occurred on March 1, 2022. The second occurred on December 31, 2022, and the final occurred on July 1, 2023. See Note 4 for further information regarding this transaction.

[2] Represents severance, expenses associated with streamlining the Company’s organizational and legal structure, and other expenses associated with the Company’s program to redeploy expenses in its cost base through optimizations in vendor management, real estate, marketing, and people strategy, as previously announced in October 2022. In 2023 and 2022, expenses incurred under the program also included non-cash impairments of operating lease right-of-use assets and property and equipment. The expenses are not included in the measurement of segment operating income provided to the CODM for purposes of performance assessment and resource allocation. These expenses are therefore excluded from the Company’s segment operating income results.

[3] Represents the exit costs incurred in connection with the Company’s suspension of its operations in Russia and Belarus and the divestiture of the Business Solutions business, primarily related to severance and non-cash impairments of property and equipment, an operating lease right-of-use asset, and other intangible assets. While certain of the expenses are identifiable to the Company’s segments, the expenses are not included in the measurement of segment operating income provided to the CODM for purposes of performance assessment and resource allocation. These expenses are therefore excluded from the Company’s segment operating income results.