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Stock Transactions And Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 29, 2017
Share-based Compensation [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 29, 2017
 
September 30, 2016
 
September 29, 2017
 
September 30, 2016
Restricted stock units (“RSUs”)/performance stock units (“PSUs”):
 
 
 
 
 
 
 
Pretax compensation expense
$
21.9

 
$
21.1

 
$
67.6

 
$
65.0

Income tax benefit
(6.6
)
 
(6.2
)
 
(20.7
)
 
(19.1
)
RSU/PSU expense, net of income taxes
15.3

 
14.9

 
46.9

 
45.9

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
11.5

 
10.3

 
37.2

 
31.3

Income tax benefit
(3.6
)
 
(3.2
)
 
(11.8
)
 
(9.7
)
Stock option expense, net of income taxes
7.9

 
7.1

 
25.4

 
21.6

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
33.4

 
31.4

 
104.8

 
96.3

Income tax benefit
(10.2
)
 
(9.4
)
 
(32.5
)
 
(28.8
)
Total stock-based compensation expense, net of income taxes
$
23.2

 
$
22.0

 
$
72.3

 
$
67.5