Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net Sales		$ 797.2	$ 833.6	$ 993.3
Income (Loss) from Operations		110.0	145.0	219.3
Assets	[1]	806.9	828.3	883.3
Depreciation and Amortization		56.7	46.3	40.3
Capital Expenditures		61.8	54.2	42.3
Capital Markets - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		185.9	180.2	181.0
Capital Markets - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		355.4	410.3	561.5
Investment Companies - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		106.8	99.4	89.0
Investment Companies - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		149.1	143.7	161.8
Operating Segments
Segment Reporting Information [Line Items]
Net Sales		797.2	833.6	993.3
Income (Loss) from Operations		177.5	202.5	296.9
Assets	[1]	683.2	710.2	745.4
Depreciation and Amortization		56.6	46.2	39.9
Capital Expenditures		59.5	50.6	37.7
Operating Segments | Capital Markets - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		185.9	180.2	181.0
Income (Loss) from Operations		6.8	13.5	30.4
Assets	[1]	191.0	187.4	186.6
Depreciation and Amortization		29.8	23.0	16.7
Capital Expenditures		31.5	27.0	18.8
Operating Segments | Capital Markets - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		355.4	410.3	561.5
Income (Loss) from Operations		103.9	131.4	242.6
Assets	[1]	359.5	387.7	418.3
Depreciation and Amortization		8.0	6.7	5.9
Capital Expenditures		7.4	5.0	3.0
Operating Segments | Investment Companies - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		106.8	99.4	89.0
Income (Loss) from Operations		22.1	21.9	8.9
Assets	[1]	100.9	98.4	91.2
Depreciation and Amortization		14.2	11.9	12.6
Capital Expenditures		18.8	15.6	13.0
Operating Segments | Investment Companies - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		149.1	143.7	161.8
Income (Loss) from Operations		44.7	35.7	15.0
Assets	[1]	31.8	36.7	49.3
Depreciation and Amortization		4.6	4.6	4.7
Capital Expenditures		1.8	3.0	2.9
Corporate
Segment Reporting Information [Line Items]
Net Sales		0.0	0.0	0.0
Income (Loss) from Operations		(67.5)	(57.5)	(77.6)
Assets	[1]	123.7	118.1	137.9
Depreciation and Amortization		0.1	0.1	0.4
Capital Expenditures		$ 2.3	$ 3.6	$ 4.6

[1] Certain assets are recorded within a segment based on predominant usage, however, as they benefit more than one segment, the related operating expenses are allocated between segments.