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Stock Transactions And Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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
 
Six-Month Period Ended
 
June 30, 2017
 
July 1, 2016
 
June 30, 2017
 
July 1, 2016
Restricted stock units (“RSUs”)/performance stock units (“PSUs”):
 
 
 
 
 
 
 
Pretax compensation expense
$
24.1

 
$
24.0

 
$
45.7

 
$
43.9

Income tax benefit
(7.4
)
 
(7.2
)
 
(14.1
)
 
(12.9
)
RSU/PSU expense, net of income taxes
16.7

 
16.8

 
31.6

 
31.0

Stock options:
 
 
 
 
 
 
 
Pretax compensation expense
13.7

 
11.3

 
25.7

 
21.0

Income tax benefit
(4.4
)
 
(3.5
)
 
(8.2
)
 
(6.5
)
Stock option expense, net of income taxes
9.3

 
7.8

 
17.5

 
14.5

Total stock-based compensation:
 
 
 
 
 
 
 
Pretax compensation expense
37.8

 
35.3

 
71.4

 
64.9

Income tax benefit
(11.8
)
 
(10.7
)
 
(22.3
)
 
(19.4
)
Total stock-based compensation expense, net of income taxes
$
26.0

 
$
24.6

 
$
49.1

 
$
45.5