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Fixed Assets (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of Fixed Assets

Major classes of fixed assets consist of the following (in millions):

 

     December 31,  
     2018     2017  

Office equipment

   $ 30.0     $ 28.6  

Furniture and fixtures

     116.9       112.3  

Leasehold improvements

     132.1       124.2  

Computer equipment

     145.1       147.9  

Land and buildings - corporate headquarters

     144.3       143.6  

Software

     346.0       291.9  

Other

     12.4       12.0  

Work in process

     14.9       20.1  
  

 

 

   

 

 

 
     941.7       880.6  

Accumulated depreciation

     (504.8     (468.4
  

 

 

   

 

 

 

Net fixed assets

   $ 436.9     $ 412.2