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Intangible Assets
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
6.
Intangible Assets
The carrying amount of goodwill at June 30, 2019 and December 31, 2018 allocated by domestic and foreign operations is as follows (in millions):
                                 
 
Brokerage
   
Risk
Management
   
Corporate
   
Total
 
At June 30, 2019
   
     
     
     
 
United States
  $
2,861.9
    $
  29.6
    $
  —  
     $
2,891.5
 
United Kingdom
   
1,144.6
     
8.8
     
—  
      
1,153.4
 
Canada
   
446.5
     
—  
      
—  
      
446.5
 
Australia
   
415.7
     
0.3
     
—  
      
416.0
 
New Zealand
   
207.9
     
10.1
     
—  
      
218.0
 
Other foreign
   
113.4
     
—  
      
3.1
     
116.5
 
                                 
Total goodwill
  $
5,190.0
    $
48.8
    $
3.1
    $
5,241.9
 
                                 
                                 
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
six-month
period ended June 30, 2019 are as follows (in millions):
                                 
 
Brokerage
   
Risk
Management
   
Corporate
   
Total
 
Balance as of December 31, 2018
  $
4,573.6
    $
  49.3
    $
  2.7
    $
4,625.6
 
Goodwill acquired during the period
   
603.9
     
—  
      
0.4
     
604.3
 
Goodwill adjustments due to appraisals and other acquisition adjustments
   
17.3
     
(0.3
 )    
—  
      
17.0
 
Goodwill
written-off
related to sales of business
    
(7.2
 )    
—  
      
—  
      
(7.2
 )
Foreign currency translation adjustments during the period
   
2.4
     
(0.2
 )    
—  
      
2.2
 
                                 
Balance as of June 30, 2019
  $
5,190.0
    $
48.8
    $
3.1
    $
5,241.9
 
                                 
 
 
 
 
Major classes of amortizable intangible assets at June 30, 2019 and December 31, 2018 consist of the following (in millions):
                 
 
June 30,
2019
   
December 31,
2018
 
Expiration lists
  $
3,749.6
    $
3,379.4
 
Accumulated amortization - expiration lists
   
(1,824.6
 )    
(1,676.8
 )
                 
   
1,925.0
     
1,702.6
 
                 
Non-compete
agreements
    
74.6
     
58.0
 
Accumulated amortization -
non-compete
agreements
    
(51.5
 )    
(48.5
 )
                 
   
23.1
     
9.5
 
                 
Trade names
   
88.4
     
86.0
 
Accumulated amortization - trade names
   
(27.7
 )    
(25.1
 )
                 
   
60.7
     
60.9
 
                 
Net amortizable assets
  $
2,008.8
    $
1,773.0
 
                 
 
 
 
 
 
 
 
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows:
                 
2019 (remaining six months)
   
    $
162.3
 
2020
   
     
311.8
 
2021
   
     
287.5
 
2022
   
     
258.3
 
2023
   
     
232.9
 
Thereafter
   
     
756.0
 
                 
Total
   
    $
2,008.8