Restructuring, Impairment and Other Charges, net - Schedule of Restructuring, Impairment and Other Charges by Segment Recognized in Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Restructuring Cost And Reserve [Line Items]
Employee Terminations	$ 10.8	$ 1.6
Other Charges	0.1	0.2
Total	10.9	1.8
Capital Markets - Software Solutions
Restructuring Cost And Reserve [Line Items]
Employee Terminations	2.0	0.8
Other Charges	0.0	0.0
Total	2.0	0.8
Capital Markets - Compliance and Communications Management
Restructuring Cost And Reserve [Line Items]
Employee Terminations	8.2	0.3
Other Charges	0.1	0.1
Total	8.3	0.4
Investment Companies - Software Solutions
Restructuring Cost And Reserve [Line Items]
Employee Terminations	(0.1)	0.1
Other Charges	0.0	0.0
Total	(0.1)	0.1
Investment Companies - Compliance and Communications Management
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.2	0.4
Other Charges	0.0	0.0
Total	0.2	0.4
Corporate
Restructuring Cost And Reserve [Line Items]
Employee Terminations	0.5	0.0
Other Charges	0.0	0.1
Total	$ 0.5	$ 0.1