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Share-Based Payments (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
(In millions)
2018
 
2017
Research and development
$
21.9

 
$
18.7

Selling, general and administrative
28.5

 
29.4

Subtotal
50.4

 
48.1

Capitalized share-based compensation costs
(3.4
)
 
(2.7
)
Share-based compensation expense included in total cost and expenses
47.0

 
45.4

Income tax effect
(7.6
)
 
(12.4
)
Share-based compensation expense included in net income attributable to Biogen Inc.
$
39.4

 
$
33.0
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 March 31,
(In millions)
2018
 
2017
Market stock units
$
6.1

 
$
9.6

Time-vested restricted stock units
36.1

 
26.9

Cash settled performance units
4.3

 
3.5

Performance units
(0.8
)
 
4.5

Performance stock units settled in stock
0.7

 
—

Performance stock units settled in cash
0.1

 
—

Employee stock purchase plan
3.9

 
3.6

Subtotal
50.4

 
48.1

Capitalized share-based compensation costs
(3.4
)
 
(2.7
)
Share-based compensation expense included in total cost and expenses
$
47.0

 
$
45.4