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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

Goodwill
The changes in the carrying amount of goodwill by operating segment for the years ended December 31, 2018 and 2017 are as follows:
 
December 31, 2018
(In millions)
Beginning Balance
 
Acquisitions/
Dispositions(a)
 
Currency
 
Ending Balance
 
 
 
 
 
 
 
 
Goodwill:
 
 
 
 
 
 
 
North America
$
32.0

 
307.0

 
(2.0
)
 
337.0

South America
214.9

 
(3.0
)
 
(61.8
)
 
150.1

Rest of World
206.8

 
(5.5
)
 
(9.8
)
 
191.5

Total Goodwill
$
453.7

 
298.5

 
(73.6
)
 
678.6


(a)
Includes adjustments related to prior year acquisitions of $0.1 million in North America, $3.0 million in South America and $0.8 million in Rest of World. Also includes derecognition of $6.2 million related to the disposition of our French airport security services company in Rest of World.

 
December 31, 2017
(In millions)
Beginning Balance
 
Acquisitions/
Dispositions
 
Currency
 
Ending Balance
 
 
 
 
 
 
 
 
Goodwill:
 
 
 
 
 
 
 
North America
$
23.9

 
7.8

 
0.3

 
32.0

South America
27.1

 
203.7

 
(15.9
)
 
214.9

Rest of World
135.2

 
55.0

 
16.6

 
206.8

Total Goodwill
$
186.2

 
266.5

 
1.0

 
453.7



Intangible Assets
The following table summarizes our other intangible assets by category:
 
December 31, 2018
 
December 31, 2017
 
 
(In millions)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Weighted-average amortization period
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
259.9

 
(58.9
)
 
201.0

 
137.5

 
(51.9
)
 
85.6

 
12.7

Indefinite-lived trade names
7.9

 
—

 
7.9

 
7.9

 
—

 
7.9

 
—

Finite-lived trade names
20.3

 
(3.8
)
 
16.5

 
8.4

 
(2.3
)
 
6.1

 
7.0

Other contract-related assets
5.7

 
(3.1
)
 
2.6

 
6.6

 
(3.0
)
 
3.6

 
5.7

Other
5.9

 
(5.0
)
 
0.9

 
6.5

 
(4.0
)
 
2.5

 
1.6

Total
$
299.7

 
(70.8
)
 
228.9

 
$
166.9

 
(61.2
)
 
105.7

 
 


Total amortization expense for our finite-lived intangible assets was $17.7 million in 2018 and $8.4 million in 2017.  Our estimated aggregate amortization expense for finite-lived intangibles recorded at December 31, 2018, for the next five years is as follows:

(In millions)
2019
 
2020
 
2021
 
2022
 
2023
 
 
 
 
 
 
 
 
 
 
Amortization expense
$
20.5

 
19.9

 
19.5

 
18.2

 
17.5