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Share-Based Compensation (Tables)
 12 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Expense
The following table presents the details of the Company's share-based compensation expense (in millions):
 
Year Ended March 31,
 
2019
 
2018
 
2017
Cost of sales (1)
$
14.9

 
$
13.8

 
$
18.7

Research and development
72.0

 
42.5

 
46.8

Selling, general and administrative
62.3

 
36.9

 
62.6

Special (income) charges and other, net
17.2

 
—

 
—

Pre-tax effect of share-based compensation
166.4

 
93.2

 
128.1

Income tax benefit
35.5

 
28.3

 
44.2

Net income effect of share-based compensation
$
130.9

 
$
64.9

 
$
83.9


 
(1) During the year ended March 31, 2019, $17.2 million of share-based compensation expense was capitalized to inventory, and $14.9 million of previously capitalized share-based compensation expense in inventory was sold. During the year ended March 31, 2018, $11.9 million of share-based compensation expense was capitalized to inventory and $13.8 million of previously capitalized share-based compensation expense in inventory that was sold. During the year ended March 31, 2017, $11.3 million of share-based compensation expense was capitalized to inventory. The amount of share-based compensation included in cost of sales during fiscal 2017 included $14.5 million of previously capitalized share-based compensation expense in inventory was sold and $4.2 million of share-based compensation expense related to the Company's acquisition of Atmel that was not previously capitalized into inventory.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
RSU share activity under the 2004 Plan is set forth below:
 
Number of
Shares
 
Weighted Average Grant Date Fair Value
Nonvested shares at March 31, 2016
6,307,742

 
$
36.76

Granted
1,635,655

 
51.46

Assumed upon acquisition
2,059,524

 
46.57

Forfeited
(722,212
)
 
43.58

Vested
(2,861,253
)
 
38.60

Nonvested shares at March 31, 2017
6,419,456

 
42.06

Granted
1,267,536

 
77.26

Forfeited
(279,051
)
 
49.65

Vested
(1,735,501
)
 
38.00

Nonvested shares at March 31, 2018
5,672,440

 
50.79

Granted
1,951,408

 
77.83

Assumed upon acquisition

1,805,680

 
91.70

Forfeited
(408,242
)
 
73.36

Vested
(2,729,324
)
 
61.51

Nonvested shares at March 31, 2019
6,291,962

 
$
64.81
Schedule of Share-based Compensation, Stock Options, Activity
Stock option and stock appreciation right (SAR) activity under the Company's stock incentive plans in the three years ended March 31, 2019 is set forth below:
 
Number of
Shares
 
Weighted Average Exercise Price per Share
Outstanding at March 31, 2016
913,508

 
$
33.00

Exercised
(437,906
)
 
34.34

Forfeited or expired
(42,485
)
 
34.26

Outstanding at March 31, 2017
433,117

 
31.51

Exercised
(131,666
)
 
31.75

Forfeited or expired
(17,111
)
 
34.73

Outstanding at March 31, 2018
284,340

 
31.21

Assumed upon acquisition
141,751

 
25.86

Exercised
(140,118
)
 
27.67

Forfeited or expired
(4,091
)
 
39.62

Outstanding at March 31, 2019
281,882

 
$
30.16