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Stockholders' Equity and Share-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Changes In Stock Options
The following table summarizes the changes in the number of shares of common stock under option for 2019 (shares and aggregate intrinsic value in millions):

 
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted
Average
Remaining Life
(years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2018
0.3

 
$
15

 
 
 
 
Granted
1.3

 
18

 
 
 
 
Exercised
—

 
9

 
 
 
 
Outstanding at December 31, 2019
1.6

 
$
17

 
8.4
 
2.9

 
 
 
 
 
 
 
 
Options exercisable, end of year
0.3

 
$
15

 
1.5
 
1.0
Summary of Changes of Restricted Stock and Restricted Stock Units
The following table summarizes the changes in the number of outstanding restricted stock units for 2019 (shares in millions):
 
Restricted
Stock
Units
 
Weighted-
Average Grant
Date Fair Value
Per Share
Outstanding at December 31, 2018
4.7

 
$
41

Granted
3.0

 
17
Grant adjustment (1)
(0.7
)
 
63
Vested
(1.0
)
 
36
Forfeited
(1.2
)
 
30
Outstanding at December 31, 2019
4.8

 
25
 
 
 
 
Expected to vest at December 31, 2019
4.3

 
21

(1)
The Grant Adjustment primarily relates to an adjustment in the quantity of Stock-Price Based RSUs ultimately vested during 2019 that were dependent on the level of achievement of the specified performance conditions.
Summary of Total Unrecognized Compensation Cost Related to Stock-based Compensation
The following table summarizes the Company’s total unrecognized compensation cost related to stock-based compensation at December 31, 2019 (in millions):
 
Unrecognized
Compensation
Cost
 
Weighted-
Average Period
of Expense 
Recognition
(in years)
Restricted stock units
$
44.5

 
1
Stock options
4.6

 
1
Total
$
49.1

 
1