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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 27, 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
 
Nine Months Ended
 
September 27, 2019
 
September 28, 2018
 
September 27, 2019
 
September 28, 2018
Stock Awards:
 
 
 
 
 
 
 
Pretax compensation expense
$
11.1

 
$
7.9

 
$
29.0

 
$
22.3

Income tax benefit
(2.3
)
 
(1.7
)
 
(6.1
)
 
(4.7
)
Stock Award expense, net of income taxes
8.8

 
6.2

 
22.9

 
17.6

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
5.6

 
5.0

 
16.5

 
15.0

Income tax benefit
(1.2
)
 
(1.1
)
 
(3.5
)
 
(3.2
)
Stock option expense, net of income taxes
4.4

 
3.9

 
13.0

 
11.8

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
16.7

 
12.9

 
45.5

 
37.3

Income tax benefit
(3.5
)
 
(2.8
)
 
(9.6
)
 
(7.9
)
Total stock-based compensation expense, net of income taxes
$
13.2

 
$
10.1

 
$
35.9

 
$
29.4
Schedule of Future Compensation Future compensation amounts will be adjusted for any changes in estimated forfeitures ($ in millions):
Stock Awards
$
68.5

Stock options
60.5

Total unrecognized compensation cost
$
129.0