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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity
Stock option activity for 2018 is summarized in the following table:
 
Shares subject to option
 
Weighted average exercise price per share
 
Aggregate intrinsic value
(in millions)
Outstanding at December 30, 2017
3,045,316

 
$
58.96

 
 
Expired / Forfeited
(4,823
)
 
57.94

 
 
Exercised
(3,747
)
 
57.78

 
 
Outstanding at March 31, 2018
3,036,746

 
$
58.96

 
$
0.7

Exercisable at March 31, 2018
1,800,064

 
$
59.56

 
$
0.7

Time Vested, Performance Vested and Market Vested Share Awards Activity
The Company also has time-vested, performance-vested and market-vested share awards. The activity for such awards in 2018 is summarized in the following table:
 
Shares outstanding
 
Weighted average grant date fair value
December 30, 2017
635,507

 
$
58.59

Time-vested shares granted
4,957

 
60.53

Market-vested shares granted
24,571

 
63.48

Performance shares granted
92,621

 
50.51

Performance share adjustments
(30,345
)
 
55.70

Vested
(75,452
)
 
71.18

Forfeited
(24,230
)
 
60.23

March 31, 2018
627,629

 
$
56.16

Schedule of Compensation Expense
Compensation expense related to the Company's stock-based compensation for the first quarters ended March 31, 2018 and April 1, 2017 were as follows:
 
First Quarter
(In millions)
2018
 
2017
Stock options
$
0.8

 
$
0.7

Time, performance and market vested share awards
2.5

 
4.1