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Fixed Assets (Tables)
12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Schedule of Components of Fixed Assets
Fixed assets consisted of the following at December 31 (in millions):
 20242023
Leasehold improvements$28.5 $30.0 
Office equipment8.7 9.5 
Furniture and fixtures6.3 6.2 
Software and web development111.1 118.0 
Fixed assets, at cost154.6 163.7 
Accumulated depreciation and amortization(118.9)(119.5)
Fixed assets, net$35.7 $44.2