Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022		Mar. 31, 2021		Dec. 31, 2021
Segment Reporting Information [Line Items]
Net Sales		$ 211.0		$ 245.3
Income (Loss) from Operations		35.3		50.9
Assets		871.6	[1]	900.1	[1]	$ 883.3
Depreciation and Amortization		10.7		9.8
Capital Expenditures		9.9		8.0
Capital Markets - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		44.7		38.5
Income (Loss) from Operations		4.3		6.5
Assets	[1]	189.9		171.6
Depreciation and Amortization		5.1		3.7
Capital Expenditures		5.3		3.7
Capital Markets - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		103.6		138.5
Income (Loss) from Operations		28.9		59.1
Assets	[1]	437.2		448.7
Depreciation and Amortization		1.5		1.5
Capital Expenditures		0.7		0.6
Investment Companies - Software Solutions
Segment Reporting Information [Line Items]
Net Sales		25.1		21.8
Income (Loss) from Operations		6.2		2.0
Assets	[1]	99.4		97.6
Depreciation and Amortization		2.9		3.6
Capital Expenditures		3.0		1.8
Investment Companies - Compliance and Communications Management
Segment Reporting Information [Line Items]
Net Sales		37.6		46.5
Income (Loss) from Operations		8.1		6.3
Assets	[1]	53.1		65.2
Depreciation and Amortization		1.1		1.0
Capital Expenditures		0.6		0.5
Operating Segments
Segment Reporting Information [Line Items]
Net Sales		211.0		245.3
Income (Loss) from Operations		47.5		73.9
Assets	[1]	779.6		783.1
Depreciation and Amortization		10.6		9.8
Capital Expenditures		9.6		6.6
Corporate
Segment Reporting Information [Line Items]
Net Sales		0.0		0.0
Income (Loss) from Operations		(12.2)		(23.0)
Assets	[1]	92.0		117.0
Depreciation and Amortization		0.1		0.0
Capital Expenditures		$ 0.3		$ 1.4

[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.