Segment Information - Schedule of Depreciation and Amortization, Assets and Capital Expenditures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 15.0	$ 14.1
Capital expenditures	10.4	13.3
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	15.0	14.1
Capital expenditures	9.9	13.2
Operating Segments \| Capital Markets - Software Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization	7.6	7.0
Capital expenditures	5.3	6.2
Operating Segments \| Capital Markets - Compliance and Communications Management
Segment Reporting Information [Line Items]
Depreciation and amortization	1.6	1.4
Capital expenditures	1.5	2.0
Operating Segments \| Investment Companies - Software Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization	4.8	4.8
Capital expenditures	2.8	4.5
Operating Segments \| Investment Companies - Compliance and Communications Management
Segment Reporting Information [Line Items]
Depreciation and amortization	1.0	0.9
Capital expenditures	0.3	0.5
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	0.0	0.0
Capital expenditures	$ 0.5	$ 0.1