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Intangible Assets
 12 Months Ended
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible assets

The following table summarizes the Company's intangible assets:
(In millions)
Currently marketed products
 
IPR&D
 
Other intangible assets
 
Total
December 31, 2017
 

 
 

 
 

 
 

Gross acquired intangible assets
$
31,973.5

 
$
5,113.9

 
$
835.9

 
$
37,923.3

Accumulated amortization
(4,549.2
)
 
—

 
(328.0
)
 
(4,877.2
)
Intangible assets, net
$
27,424.3


$
5,113.9


$
507.9


$
33,046.1

 
 
 
 
 
 
 
 
December 31, 2016
 

 
 

 
 

 
 

Gross acquired intangible assets
$
31,217.5

 
$
5,746.6

 
$
842.2

 
$
37,806.3

Accumulated amortization
(2,908.6
)
 
—

 
(200.2
)
 
(3,108.8
)
Intangible assets, net
$
28,308.9


$
5,746.6


$
642.0


$
34,697.5



Other intangible assets are comprised primarily of royalty rights and other contract rights associated with Baxalta, Dyax and NPS. 

The change in the net book value of intangible assets for the years ended December 31, 2017 and 2016 is shown in the table below: 
(In millions)
2017
 
2016
As of January 1,
$
34,697.5

 
$
9,173.3

Acquisitions
(1,385.0
)
 
27,462.8

Amortization charged
(1,768.4
)
 
(1,173.4
)
Impairment charges
(20.0
)
 
(8.9
)
Foreign currency translation
1,522.0

 
(756.3
)
As of December 31,
$
33,046.1

 
$
34,697.5

 

The decrease in Intangible assets, net during the year ended December 31, 2017 relates to the measurement period adjustments of the acquisition of Baxalta and amortization of intangible assets. For a more detailed description of measurement period adjustments, refer to Note 3, Business Combinations, to these Consolidated Financial Statements.

In connection with the acquisition of Baxalta, the Company acquired IP rights related to currently marketed products of $21,165.0 million, IPR&D assets of $160.0 million and other contract rights of $42.2 million. For a more detailed description of this acquisition, refer to Note 3, Business Combinations, to these Consolidated Financial Statements.

In connection with the acquisition of Dyax on January 22, 2016, the Company acquired IP rights related to currently marketed products of $135.0 million, IPR&D assets of $4,100.0 million and royalty rights of $425.0 million. For a more detailed description of this acquisition, refer to Note 3, Business Combinations, to these Consolidated Financial Statements.

Estimated amortization expense can be affected by various factors including future acquisitions, disposals of product rights, regulatory approval and subsequent amortization of acquired IPR&D projects, foreign exchange movements and the technological advancement and regulatory approval of competitor products. The estimated future amortization of acquired intangible assets for the next five years is expected to be as follows:
(In millions)
Anticipated
future amortization
2018
$
1,891.6

2019
1,668.4

2020
1,570.3

2021
1,536.7

2022
1,511.0