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Restructuring, Impairment and Other Charges, net - Schedule of Restructuring, Impairment and Other Charges by Segment Recognized in Results of Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost And Reserve [Line Items]      
Employee Terminations $ 9.2 $ 6.8 $ 3.4
Other Restructuring Charges 0.1 0.4 0.8
Impairment Charges 0.1 0.1 9.2
Other Charges 0.4 0.4 0.2
Total 9.8 7.7 13.6
Operating Segments | Capital Markets - Software Solutions      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 2.7 1.5 0.4
Other Restructuring Charges 0.0 0.0 0.0
Impairment Charges 0.0 0.0 0.0
Other Charges 0.0 0.0 0.0
Total 2.7 1.5 0.4
Operating Segments | Capital Markets - Compliance and Communications Management      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 4.9 3.5 0.5
Other Restructuring Charges 0.1 0.0 0.0
Impairment Charges 0.1 0.0 2.8
Other Charges 0.2 0.2 0.2
Total 5.3 3.7 3.5
Operating Segments | Investment Companies - Software Solutions      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 0.6 0.5 0.1
Other Restructuring Charges 0.0 0.0 0.0
Impairment Charges 0.0 0.0 0.0
Other Charges 0.0 0.0 0.0
Total 0.6 0.5 0.1
Operating Segments | Investment Companies - Compliance and Communications Management      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 0.1 1.0 2.1
Other Restructuring Charges 0.0 0.4 0.8
Impairment Charges 0.0 0.0 0.0
Other Charges 0.0 0.0 0.0
Total 0.1 1.4 2.9
Corporate      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 0.9 0.3 0.3
Other Restructuring Charges 0.0 0.0 0.0
Impairment Charges 0.0 0.1 6.4
Other Charges 0.2 0.2 0.0
Total $ 1.1 $ 0.6 $ 6.7