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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations
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
 
                                 
 
 
 
 
 
 
Changes in Carrying Amount of Goodwill
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
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
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