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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 28, 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
 
Nine Months Ended
 
September 28, 2018
 
September 29, 2017
 
September 28, 2018
 
September 29, 2017
Stock Awards:
 
 
 
 
 
 
 
Pretax compensation expense
$
8.5

 
$
7.2

 
$
24.1

 
$
22.6

Income tax benefit
(1.8
)
 
(2.4
)
 
(5.1
)
 
(8.0
)
Stock Award expense, net of income taxes
6.7

 
4.8

 
19.0

 
14.6

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
5.5

 
4.7

 
16.4

 
14.6

Income tax benefit
(1.2
)
 
(1.6
)
 
(3.5
)
 
(5.0
)
Stock option expense, net of income taxes
4.3

 
3.1

 
12.9

 
9.6

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
14.0

 
11.9

 
40.5

 
37.2

Income tax benefit
(3.0
)
 
(4.0
)
 
(8.6
)
 
(13.0
)
Total stock-based compensation expense, net of income taxes
$
11.0

 
$
7.9

 
$
31.9

 
$
24.2
Schedule of Future Compensation Future compensation amounts will be adjusted for any changes in estimated forfeitures ($ in millions):
Stock Awards
$
52.8

Stock options
51.7

Total unrecognized compensation cost
$
104.5