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Stock Transactions And Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Components Of Stock-Based Compensation Program
The following summarizes the components of the Company’s stock-based compensation expense ($ in millions):
 
Three-Month Period Ended
 
Nine-Month Period Ended
 
September 28, 2018
 
September 29, 2017
 
September 28, 2018
 
September 29, 2017
Restricted stock units (“RSUs”)/performance stock units (“PSUs”):
 
 
 
 
 
 
 
Pretax compensation expense
$
24.0

 
$
21.9

 
$
69.6

 
$
67.6

Income tax benefit
(5.0
)
 
(6.6
)
 
(14.6
)
 
(20.7
)
RSU/PSU expense, net of income taxes
19.0

 
15.3

 
55.0

 
46.9

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
14.2

 
11.5

 
42.0

 
37.2

Income tax benefit
(3.0
)
 
(3.6
)
 
(8.9
)
 
(11.8
)
Stock option expense, net of income taxes
11.2

 
7.9

 
33.1

 
25.4

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
38.2

 
33.4

 
111.6

 
104.8

Income tax benefit
(8.0
)
 
(10.2
)
 
(23.5
)
 
(32.5
)
Total stock-based compensation expense, net of income taxes
$
30.2

 
$
23.2

 
$
88.1

 
$
72.3