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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Restructuring Cost And Reserve [Line Items]      
Employee Terminations $ 6.8 $ 3.4 $ 15.6
Other Restructuring Charges 0.4 0.8  
Impairment Charges 0.1 9.2 60.6
Other Charges 0.4 0.2 3.0
Total 7.7 13.6 79.2
Capital Markets - Software Solutions      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 1.5 0.4 1.0
Other Restructuring Charges 0.0 0.0  
Impairment Charges 0.0 0.0 0.0
Other Charges 0.0 0.0 0.0
Total 1.5 0.4 1.0
Capital Markets - Compliance and Communications Management      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 3.5 0.5 5.8
Other Restructuring Charges 0.0 0.0  
Impairment Charges 0.0 2.8 16.1
Other Charges 0.2 0.2 0.3
Total 3.7 3.5 22.2
Investment Companies - Software Solutions      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 0.5 0.1 0.4
Other Restructuring Charges 0.0 0.0  
Impairment Charges 0.0 0.0 2.6
Other Charges 0.0 0.0 0.0
Total 0.5 0.1 3.0
Investment Companies - Compliance and Communications Management      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 1.0 2.1 5.6
Other Restructuring Charges 0.4 0.8  
Impairment Charges 0.0 0.0 40.6
Other Charges 0.0 0.0 0.0
Total 1.4 2.9 46.2
Corporate      
Restructuring Cost And Reserve [Line Items]      
Employee Terminations 0.3 0.3 2.8
Other Restructuring Charges 0.0 0.0  
Impairment Charges 0.1 6.4 1.3
Other Charges 0.2 0.0 2.7
Total $ 0.6 $ 6.7 $ 6.8