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Stock Transactions And Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31, 2017
 
April 1, 2016
Restricted stock units (“RSUs”)/performance stock units (“PSUs”):
 
 
 
Pretax compensation expense
$
21.6

 
$
19.9

Income tax benefit
(6.7
)
 
(5.7
)
RSU/PSU expense, net of income taxes
14.9

 
14.2

Stock options:
 
 
 
Pretax compensation expense
12.0

 
9.7

Income tax benefit
(3.8
)
 
(3.0
)
Stock option expense, net of income taxes
8.2

 
6.7

Total stock-based compensation:
 
 
 
Pretax compensation expense
33.6

 
29.6

Income tax benefit
(10.5
)
 
(8.7
)
Total stock-based compensation expense, net of income taxes
$
23.1

 
$
20.9