Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023		Mar. 31, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Net Sales		$ 198.6		$ 211.0
(Loss) Income from Operations		14.8		35.3
Assets		871.3	[1]	871.6	[1]	$ 828.3
Depreciation and Amortization		12.4		10.7
Capital Expenditures		10.6		9.9
Capital Markets - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		43.7		44.7
(Loss) Income from Operations		(0.6)		4.3
Assets	[1]	189.7		189.9
Depreciation and Amortization		6.2		5.1
Capital Expenditures		5.5		5.3
Capital Markets - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		94.1		103.6
(Loss) Income from Operations		16.6		28.9
Assets	[1]	415.3		437.2
Depreciation and Amortization		1.8		1.5
Capital Expenditures		1.1		0.7
Investment Companies - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		26.4		25.1
(Loss) Income from Operations		5.0		6.2
Assets	[1]	103.3		99.4
Depreciation and Amortization		3.3		2.9
Capital Expenditures		3.5		3.0
Investment Companies - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		34.4		37.6
(Loss) Income from Operations		8.1		8.1
Assets	[1]	43.6		53.1
Depreciation and Amortization		1.1		1.1
Capital Expenditures		0.3		0.6
Operating Segments
Segment Reporting Information [Line Items]
Net Sales		198.6		211.0
(Loss) Income from Operations		29.1		47.5
Assets	[1]	751.9		779.6
Depreciation and Amortization		12.4		10.6
Capital Expenditures		10.4		9.6
Corporate
Segment Reporting Information [Line Items]
Net Sales		0.0		0.0
(Loss) Income from Operations		(14.3)		(12.2)
Assets	[1]	119.4		92.0
Depreciation and Amortization		0.0		0.1
Capital Expenditures		$ 0.2		$ 0.3

[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.