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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations
The carrying amount of goodwill at March 31, 2019 and December 31, 2018 allocated by domestic and foreign operations is as follows (in millions):
 
 
 
Brokerage
 
 
Risk

Management
 
 
Corporate
 
 
Total
 
At March 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
United States
 
$
2,794.5
 
 
$
29.6
 
 
$
—
 
 
$
2,824.1
 
United Kingdom
 
 
784.2
 
 
 
9.6
 
 
 
—
 
 
 
793.8
 
Canada
 
 
437.4
 
 
 
—
 
 
 
—
 
 
 
437.4
 
Australia
 
 
409.2
 
 
 
0.3
 
 
 
—
 
 
 
409.5
 
New Zealand
 
 
213.3
 
 
 
10.3
 
 
 
—
 
 
 
223.6
 
Other foreign
 
 
109.8
 
 
 
—
 
 
 
2.7
 
 
 
112.5
 
Total goodwill
 
$
4,748.4
 
 
$
49.8
 
 
$
2.7
 
 
$
4,800.9
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 three-month period ended March 31, 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
 
 
131.5
 
 
 
—
 
 
 
—
 
 
 
131.5
 
Goodwill adjustments due to appraisals and other acquisition adjustments
 
 
8.4
 
 
 
—
 
 
 
—
 
 
 
8.4
 
Goodwill written-off related to sales of business
 
 
(6.6
)
 
 
—
 
 
 
—
 
 
 
(6.6
)
Foreign currency translation adjustments during the period
 
 
41.5
 
 
 
0.5
 
 
 
—
 
 
 
42.0
 
Balance as of March 31, 2019
 
$
4,748.4
 
 
$
49.8
 
 
$
2.7
 
 
$
4,800.9
 
Major Classes of Amortizable Intangible Assets
Major classes of amortizable intangible assets at March 31, 2019 and December 31, 2018 consist of the following (in millions):
 
 
 
March 31,
 
 
December 31,
 
 
 
2019
 
 
2018
 
Expiration lists
 
$
3,529.6
 
 
$
3,379.4
 
Accumulated amortization - expiration lists
 
 
(1,758.8
)
 
 
(1,676.8
)
 
 
 
1,770.8
 
 
 
1,702.6
 
Non-compete agreements
 
 
60.7
 
 
 
58.0
 
Accumulated amortization - non-compete agreements
 
 
(49.8
)
 
 
(48.5
)
 
 
 
10.9
 
 
 
9.5
 
Trade names
 
 
86.4
 
 
 
86.0
 
Accumulated amortization - trade names
 
 
(26.7
)
 
 
(25.1
)
 
 
 
59.7
 
 
 
60.9
 
Net amortizable assets
 
$
1,841.4
 
 
$
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 nine months)
 
$
226.3
 
2020
 
 
286.7
 
2021
 
 
262.8
 
2022
 
 
237.5
 
2023
 
 
213.5
 
Thereafter
 
 
614.6
 
Total
 
$
1,841.4