v3.25.2
Goodwill - Balances of Goodwill by Reporting Segment (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Gross book value   $ 446.0
Accumulated impairment charges   (40.6)
Goodwill, beginning balance $ 405.4  
Foreign exchange adjustments 0.5  
Goodwill, ending balance 405.9  
Capital Markets - Software Solutions    
Goodwill [Line Items]    
Gross book value   99.9
Accumulated impairment charges   0.0
Goodwill, beginning balance 99.9  
Foreign exchange adjustments 0.1  
Goodwill, ending balance 100.0  
Capital Markets - Compliance and Communications Management    
Goodwill [Line Items]    
Gross book value   252.5
Accumulated impairment charges   0.0
Goodwill, beginning balance 252.5  
Foreign exchange adjustments 0.3  
Goodwill, ending balance 252.8  
Investment Companies - Software Solutions    
Goodwill [Line Items]    
Gross book value   53.0
Accumulated impairment charges   0.0
Goodwill, beginning balance 53.0  
Foreign exchange adjustments 0.1  
Goodwill, ending balance 53.1  
Investment Companies - Compliance and Communications Management    
Goodwill [Line Items]    
Gross book value   40.6
Accumulated impairment charges   $ (40.6)
Goodwill, beginning balance 0.0  
Foreign exchange adjustments 0.0  
Goodwill, ending balance $ 0.0