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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 28, 2019
Share-based Payment Arrangement [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 28, 2019
 
June 29, 2018
 
June 28, 2019
 
June 29, 2018
Stock Awards:
 
 
 
 
 
 
 
Pretax compensation expense
$
10.1

 
$
7.9

 
$
17.9

 
$
14.4

Income tax benefit
(2.1
)
 
(1.6
)
 
(3.8
)
 
(3.0
)
Stock Award expense, net of income taxes
8.0

 
6.3

 
14.1

 
11.4

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
5.8

 
5.5

 
10.9

 
10.0

Income tax benefit
(1.2
)
 
(1.2
)
 
(2.3
)
 
(2.1
)
Stock option expense, net of income taxes
4.6

 
4.3

 
8.6

 
7.9

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
15.9

 
13.4

 
28.8

 
24.4

Income tax benefit
(3.3
)
 
(2.8
)
 
(6.1
)
 
(5.1
)
Total stock-based compensation expense, net of income taxes
$
12.6

 
$
10.6

 
$
22.7

 
$
19.3
Schedule of Future Compensation Future compensation amounts will be adjusted for any changes in estimated forfeitures ($ in millions):
Stock Awards
$
74.9

Stock options
62.8

Total unrecognized compensation cost
$
137.7