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Intangible Assets
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
6.
Intangible Assets
The carrying amount of goodwill at September 30, 2019 and December 31, 2018 allocated by domestic and foreign operations is as follows (in millions):
                                 
 
Brokerage
 
  
Risk
Management
 
  
Corporate
 
  
Total
 
At September 30, 2019
 
 
 
  
 
 
  
 
 
  
 
 
United States
  $
  2,950.0
    $
  33.0
    $
  —  
     $
  2,983.0
 
United Kingdom
   
1,138.6
     
12.3
     
—  
      
1,150.9
 
Canada
   
445.4
     
—  
      
—  
      
445.4
 
Australia
   
404.2
     
10.1
     
—  
      
414.3
 
New Zealand
   
196.5
     
9.5
     
—  
      
206.0
 
Other foreign
   
112.1
     
—  
      
3.1
     
115.2
 
                                 
Total goodwill
  $
5,246.8
    $
64.9
    $
3.1
    $
5,314.8
 
                                 
                                 
At December 31, 2018
 
 
 
  
 
 
  
 
 
  
 
 
United States
  $
2,715.3
    $
29.6
    $
—  
     $
2,744.9
 
United Kingdom
   
753.7
     
9.2
     
—  
      
762.9
 
Canada
   
378.6
     
—  
      
—  
      
378.6
 
Australia
   
406.3
     
0.3
     
—  
      
406.6
 
New Zealand
   
209.6
     
10.2
     
—  
      
219.8
 
Other foreign
   
110.1
     
—  
      
2.7
     
112.8
 
                                 
Total goodwill
  $
4,573.6
    $
49.3
    $
2.7
    $
4,625.6
 
                                 
 
 
 
 
 
 
The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2019 are as follows (in millions):
 
 
  
Risk
 
  
 
  
 
  
Brokerage
 
  
Management
 
  
Corporate
 
  
Total
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance as of December 31, 2018
  $
  4,573.6
    $
  49.3
    $
  2.7
    $
  4,625.6
 
Goodwill acquired during the period
   
738.8
     
16.9
     
0.4
     
756.1
 
Goodwill adjustments due to appraisals and other acquisition adjustments
   
(1.3
 )    
(0.5
 )    
—  
      
(1.8
 )
Goodwill
written-off
related to sales of business
    
(7.2
 )    
—  
      
—  
      
(7.2
 )
Foreign currency translation adjustments during the period
   
(57.1
 )    
(0.8
 )    
—  
      
(57.9
 )
                                 
Balance as of September 30, 2019
  $
5,246.8
    $
64.9
    $
3.1
    $
5,314.8
 
                                 
Major classes of amortizable intangible assets at September 30, 2019 and December 31, 2018 consist of the following (in millions):
 
September 30,
2019
 
  
December 31,
2018
 
Expiration lists
  $
3,880.4
    $
3,379.4
 
Accumulated amortization - expiration lists
   
(1,890.9
 )    
(1,676.8
 )
                 
    
1,989.5
     
1,702.6
 
                 
Non-compete
agreements
    
76.1
     
58.0
 
Accumulated amortization -
non-compete
agreements
    
(52.5
 )    
(48.5
 )
                 
    
23.6
     
9.5
 
                 
Trade names
   
89.4
     
86.0
 
Accumulated amortization - trade names
   
(29.0
 )    
(25.1
 )
                 
    
60.4
     
60.9
 
                 
Net amortizable assets
  $
2,073.5
    $
1,773.0
 
                 
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
2019 (remaining three months)
  $
85.3
 
2020
   
328.9
 
2021
   
304.7
 
2022
   
275.6
 
2023
   
249.2
 
Thereafter
   
829.8
 
         
Total
  $
  2,073.5