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Intangible Assets
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
6.
Intangible Assets
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
 
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 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 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