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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Summary Of Property, Plant And Equipment
Property and equipment, net consisted of the following (in millions):
 
    
December 31,
 
    
2021
    
2020
 
Leasehold improvements
   $  158.2      $  144.1  
Office furniture and equipment
     31.9        29.0  
Computer software and internally-developed software
     28.1        23.8  
Computer equipment
     24.2        22.0  
    
 
 
    
 
 
 
       242.4        218.9  
Less: accumulated depreciation
     (85.0      (77.2
    
 
 
    
 
 
 
Property and equipment, net
   $ 157.4      $ 141.7