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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Costs
The following summarizes the components of our stock-based compensation expense under the Stock Plan ($ in millions):
 
Three Months Ended
 
Six Months Ended
 
June 29, 2018
 
June 30, 2017
 
June 29, 2018
 
June 30, 2017
Stock Awards:
 
 
 
 
 
 
 
Pretax compensation expense
$
8.5

 
$
8.0

 
$
15.6

 
$
15.4

Income tax benefit
(1.8
)
 
(3.1
)
 
(3.3
)
 
(5.6
)
Stock Award expense, net of income taxes
6.7

 
4.9

 
12.3

 
9.8

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
6.1

 
5.3

 
10.9

 
9.9

Income tax benefit
(1.3
)
 
(1.8
)
 
(2.3
)
 
(3.4
)
Stock option expense, net of income taxes
4.8

 
3.5

 
8.6

 
6.5

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
14.6

 
13.3

 
26.5

 
25.3

Income tax benefit
(3.1
)
 
(4.9
)
 
(5.6
)
 
(9.0
)
Total stock-based compensation expense, net of income taxes
$
11.5

 
$
8.4

 
$
20.9

 
$
16.3

Schedule of Future Compensation
Future compensation amounts will be adjusted for any changes in estimated forfeitures ($ in millions):
Stock Awards
$
59.6

Stock options
56.0

Total unrecognized compensation cost
$
115.6