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Goodwill and Other Intangible Assets
 12 Months Ended
Nov. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Intangible Assets
 
Goodwill
 
The following table summarizes the Company's goodwill, which all relates to the Specialty Solutions segment:
 
Total
 
Specialty Solutions
 
Performance Materials
 
(Dollars in millions)
Balance November 30, 2017
$
66.3

 
$
66.3

 
$
—

Acquisitions
6.4

 
6.4

 
—

Currency translation adjustment
(1.8
)
 
(1.8
)
 
—

Balance November 30, 2018
70.9

 
70.9

 
—

Currency translation adjustment
(1.5
)
 
(1.5
)
 
—

Balance November 30, 2019
$
69.4

 
$
69.4

 
$
—



Intangible Assets

The following table summarizes the Company’s intangible assets:
 
November 30, 2019
 
November 30, 2018
 
November 30, 2019
 
Gross
Carrying
Amount
 
Accumulated
Amortization / Impairment
 
Gross
Carrying
Amount
 
Accumulated
Amortization / Impairment
 
Weighted Average Remaining Life
 
(Dollars in millions)
 
 
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Patents
$
19.9

 
$
19.7

 
$
20.2

 
$
19.1

 
0.5
Trademarks
9.4

 
7.4

 
9.4

 
7.3

 
7.9
Technical know-how
6.9

 
5.0

 
6.9

 
4.7

 
6.1
Customer lists
33.8

 
23.0

 
34.6

 
20.7

 
3.8
Land use rights
5.7

 
0.9

 
5.8

 
0.8

 
15.9
Other
1.9

 
1.8

 
2.1

 
2.1

 
1.5
Sub-total
$
77.6

 
$
57.8

 
$
79.0

 
$
54.7

 
4.5
Indefinite lived intangible assets:
 
 
 
 
 
 
 
 
 
Trademarks
21.2

 
—

 
29.2

 
—

 
N/A
Total
$
98.8

 
$
57.8

 
$
108.2

 
$
54.7

 
 


Amortization expense for finite-lived intangible assets was $4.4 million, $3.8 million, and $3.5 million for the years ended November 30, 2019, 2018, and 2017, respectively. The Company impaired two trademarks during 2019 and one during 2018, and recognized impairment expense of $7.8 million and $1.5 million, respectively, within the results of operations for the Performance Materials segment. Reductions in forecasted revenues or royalty rates could result in additional trademark impairments.

The following table summarizes expected future annual amortization expense for the Company’s finite-lived intangible assets:
Year Ending November 30:
(Dollars in millions)
2020
$
3.9

2021
3.7

2022
3.7

2023
3.3

2024
0.9

Thereafter
4.3

Total
$
19.8