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Stock Transactions And Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 29, 2019
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
 
March 29, 2019
 
March 30, 2018
Restricted stock units (“RSUs”)/performance stock units (“PSUs”):
 
 
 
Pretax compensation expense
$
24.3

 
$
20.9

Income tax benefit
(5.1
)
 
(4.4
)
RSU/PSU expense, net of income taxes
19.2

 
16.5

Stock options:
 
 
 
Pretax compensation expense
14.9

 
12.4

Income tax benefit
(3.2
)
 
(2.6
)
Stock option expense, net of income taxes
11.7

 
9.8

Total stock-based compensation:
 
 
 
Pretax compensation expense
39.2

 
33.3

Income tax benefit
(8.3
)
 
(7.0
)
Total stock-based compensation expense, net of income taxes
$
30.9

 
$
26.3