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