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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Summary Of Activity Of The Allowance For Credit Losses For Accounts Receivable The following table summarizes the activity of the ACL for Accounts receivable (in millions):
    
December 31,
  
    
2021
     
2020
  
Opening balance
    $ 8.1      $ 2.7  
Allowances
      1.7        6.9  
Net write-offs and other
      (2.7 )       (1.5 ) 
    
 
 
     
 
 
  
Closing balance
    $ 7.1      $ 8.1  
    
 
 
     
 
 
  
Schedule Of Useful Lives Of Property and Equipment
The useful lives of property and equipment are as follows:
 
Description
   
Useful Life
Leasehold improvements    Lesser of estimated useful life or remaining lease term
Office furniture and equipment    Five years
Computer software and internally-developed software    Three years
Computer equipment    Three years