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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Reconciliation between the U.S. federal statutory tax rate and effective tax rate
A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
 
2020
 
2019
 
2020
 
2019
Statutory rate
21.0
 %
 
21.0
 %
 
21.0
 %
 
21.0
 %
State taxes
0.4

 
0.9

 
0.5

 
0.6

Taxes on foreign earnings
(3.4
)
 
(4.6
)
 
(3.7
)
 
(4.6
)
Tax credits
(1.0
)
 
(0.9
)
 
(1.0
)
 
(0.8
)
Purchased intangible assets
0.2

 
0.4

 
0.2

 
0.4

Divestiture of Denmark manufacturing operations
—

 
—

 
—

 
2.2

Internal reorganization of certain intellectual property rights
—

 
(5.0
)
 
—

 
(2.4
)
TECFIDERA impairment
2.7

 
—

 
1.5

 
—

GILTI
1.5

 
1.4

 
1.1

 
1.7

Other permanent items
0.1

 
0.4

 
0.1

 
0.3

Other
0.4

 
0.5

 
0.1

 
0.1

Effective tax rate
21.9
 %
 
14.1
 %
 
19.8
 %
 
18.5
 %