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Intangible Assets
 3 Months Ended
Feb. 29, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

The following table presents details of our intangible assets, other than goodwill, as of February 29, 2020 and November 30, 2019 (in millions): 
 
As of February 29, 2020
 
As of November 30, 2019
 
Gross
 
Accumulated
Amortization
 
Net
 
Gross
 
Accumulated
Amortization
 
Net
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
$
3,465.3

 
$
(671.9
)
 
$
2,793.4

 
$
3,476.1

 
$
(628.7
)
 
$
2,847.4

Developed technology
946.7

 
(227.5
)
 
719.2

 
949.6

 
(208.9
)
 
740.7

Information databases
590.9

 
(324.1
)
 
266.8

 
591.6

 
(310.9
)
 
280.7

Trademarks
486.8

 
(216.7
)
 
270.1

 
487.0

 
(203.0
)
 
284.0

Developed computer software
76.1

 
(64.7
)
 
11.4

 
76.3

 
(62.9
)
 
13.4

Other
4.1

 
(1.5
)
 
2.6

 
4.1

 
(1.3
)
 
2.8

Total intangible assets
$
5,569.9

 
$
(1,506.4
)
 
$
4,063.5

 
$
5,584.7

 
$
(1,415.7
)
 
$
4,169.0



Intangible assets amortization expense was $94.2 million for the three months ended February 29, 2020, compared to $95.7 million for the three months ended February 28, 2019. The following table presents the estimated future amortization expense related to intangible assets held as of February 29, 2020 (in millions):
Year
 
Amount
Remainder of 2020
 
$
279.7

2021
 
$
368.7

2022
 
$
351.7

2023
 
$
339.5

2024
 
$
320.8

Thereafter
 
$
2,403.1


Goodwill, gross intangible assets, and net intangible assets are all subject to foreign currency translation effects. The change in net intangible assets from November 30, 2019 to February 29, 2020 was primarily due to current year amortization.