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Share-Based Payments (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense included in condensed consolidated statements of income
The following table summarizes share-based compensation expense included in our condensed consolidated statements of income:
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
(In millions)
2018
 
2017
 
2018
 
2017
Research and development
$
17.6

 
$
17.5

 
$
39.5

 
$
36.2

Selling, general and administrative
25.2

 
18.9

 
53.7

 
48.3

Subtotal
42.8

 
36.4

 
93.2

 
84.5

Capitalized share-based compensation costs
(2.8
)
 
(2.4
)
 
(6.2
)
 
(5.1
)
Share-based compensation expense included in total cost and expenses
40.0

 
34.0

 
87.0

 
79.4

Income tax effect
(6.5
)
 
(8.5
)
 
(14.1
)
 
(20.9
)
Share-based compensation expense included in net income attributable to Biogen Inc.
$
33.5

 
$
25.5

 
$
72.9

 
$
58.5
Summary of share-based compensation expense associated with each of our share-based compensating programs
The following table summarizes share-based compensation expense associated with each of our share-based compensation programs:
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
(In millions)
2018
 
2017
 
2018
 
2017
Market stock units
$
7.1

 
$
3.0

 
$
13.2

 
$
12.6

Time-vested restricted stock units
30.6

 
27.6

 
66.7

 
54.5

Cash settled performance units
(0.7
)
 
2.5

 
3.6

 
6.0

Performance units
2.0

 
1.2

 
1.2

 
5.7

Performance stock units settled in stock
1.4

 
—

 
2.1

 
—

Performance stock units settled in cash
0.3

 
—

 
0.4

 
—

Employee stock purchase plan
2.1

 
2.1

 
6.0

 
5.7

Subtotal
42.8

 
36.4

 
93.2

 
84.5

Capitalized share-based compensation costs
(2.8
)
 
(2.4
)
 
(6.2
)
 
(5.1
)
Share-based compensation expense included in total cost and expenses
$
40.0

 
$
34.0

 
$
87.0

 
$
79.4