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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations
The carrying amount of goodwill at December 31, 2019 and 2018 allocated by domestic and foreign operations is as follows (in millions):
 
 
  
Risk
 
  
 
  
 
  
Brokerage
 
  
Management
 
  
Corporate
 
  
Total
 
    
     
     
     
 
At December 31, 2019
 
 
 
  
 
 
  
 
 
  
 
 
United States
  $
3,163.8
    $
33.1
    $
—  
     $
3,196.9
 
United Kingdom
   
1,177.8
     
12.9
     
—  
      
1,190.7
 
Canada
   
454.4
     
—  
      
—  
      
454.4
 
Australia
   
416.5
     
10.5
     
—  
      
427.0
 
New Zealand
   
208.0
     
10.1
     
—  
      
218.1
 
Other foreign
   
128.4
     
—  
      
3.0
     
131.4
 
                                 
Total goodwill - net
  $
5,548.9
    $
66.6
    $
3.0
    $
5,618.5
 
                                 
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 - net
  $
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 2019 and 2018 are as follows (in millions):
 
 
  
Risk
 
  
 
  
 
  
Brokerage
 
  
Management
 
  
Corporate
 
  
Total
 
Balance as of December 31, 2017
  $
4,119.2
    $
42.6
    $
3.0
    $
4,164.8
 
Goodwill acquired during the year
   
574.7
     
9.9
     
—  
      
584.6
 
Goodwill adjustments related to appraisals and other acquisition adjustments
   
2.2
     
(2.3
 )    
—  
      
(0.1
 )
Foreign currency translation adjustments during the year
   
(122.5
 )    
(0.9
 )    
(0.3
 )    
(123.7
 )
                                 
Balance as of December 31, 2018
   
4,573.6
     
49.3
     
2.7
     
4,625.6
 
Goodwill acquired during the year
   
958.4
     
16.9
     
0.4
     
975.7
 
Goodwill adjustments related to appraisals and other acquisition adjustments
   
0.2
     
(0.2
 )    
—  
      
—  
  
Goodwill
written-off
related to sales of business
    
(7.2
 )    
—  
      
—  
      
(7.2
 )
Foreign currency translation adjustments during the year
   
23.9
     
0.6
     
(0.1
 )    
24.4
 
                                 
Balance as of December 31, 2019
  $
5,548.9
    $
66.6
    $
3.0
    $
5,618.5
 
                                 
Major Classes of Amortizable Intangible Assets
Major classes of amortizable intangible assets consist of the following (in millions):
 
December 31,
 
  
2019
 
  
2018
 
Expiration lists
  $
4,246.0
    $
3,379.4
 
Accumulated amortization - expiration lists
   
(2,004.3
 )    
(1,676.8
 )
                 
    
2,241.7
     
1,702.6
 
                 
Non-compete
agreements
    
68.4
     
58.0
 
Accumulated amortization -
non-compete
agreements
    
(52.5
 )    
(48.5
 )
                 
    
15.9
     
9.5
 
                 
Trade names
   
91.8
     
86.0
 
Accumulated amortization - trade names
   
(30.7
 )    
(25.1
 )
                 
    
61.1
     
60.9
 
                 
Net amortizable assets
  $
2,318.7
    $
1,773.0
 
                 
Estimated Aggregate Amortization Expense
Estimated aggregate amortization expense for each of the next five years is as follows (in millions):
 
2020
  $
366.5
 
2021
   
342.7
 
2022
   
316.6
 
2023
   
290.3
 
2024
   
254.0
 
Thereafter
   
748.6
 
         
Total
  $
2,318.7