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Share-Based Payments (Tables)
9 Months Ended
Sep. 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 September 30,
 
For the Nine Months
Ended September 30,
(In millions)
2018
 
2017
 
2018
 
2017
Research and development
$
21.0

 
$
19.5

 
$
60.5

 
$
55.7

Selling, general and administrative
29.4

 
23.6

 
83.1

 
71.9

Subtotal
50.4

 
43.1

 
143.6

 
127.6

Capitalized share-based compensation costs
(3.5
)
 
(2.5
)
 
(9.7
)
 
(7.6
)
Share-based compensation expense included in total cost and expenses
46.9

 
40.6

 
133.9

 
120.0

Income tax effect
(7.7
)
 
(10.9
)
 
(21.8
)
 
(31.8
)
Share-based compensation expense included in net income attributable to Biogen Inc.
$
39.2

 
$
29.7

 
$
112.1

 
$
88.2

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 September 30,
 
For the Nine Months
Ended September 30,
(In millions)
2018
 
2017
 
2018
 
2017
Market stock units
$
7.4

 
$
4.5

 
$
20.6

 
$
17.1

Time-vested restricted stock units
29.9

 
26.7

 
96.6

 
81.2

Cash settled performance units
5.8

 
7.0

 
9.4

 
13.0

Performance units
3.0

 
3.2

 
4.2

 
8.9

Performance stock units settled in stock
1.3

 

 
3.4

 

Performance stock units settled in cash
1.1

 

 
1.5

 

Employee stock purchase plan
1.9

 
1.7

 
7.9

 
7.4

Subtotal
50.4

 
43.1

 
143.6

 
127.6

Capitalized share-based compensation costs
(3.5
)
 
(2.5
)
 
(9.7
)
 
(7.6
)
Share-based compensation expense included in total cost and expenses
$
46.9

 
$
40.6

 
$
133.9

 
$
120.0