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Fixed Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 213.6 $ 213.3
Accumulated depreciation and amortization (156.0) (146.0)
Fixed assets (net) 57.6 67.3
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 110.0 108.6
Software    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 45.2 45.7
Office equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 20.2 20.7
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 17.5 17.5
Land, improvements and other    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 20.7 $ 20.8