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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Costs
The following summarizes the components of our stock-based compensation expense under the Stock Plan ($ in millions):
 
Three Months Ended
 
March 30, 2018
 
March 31, 2017
Stock Awards:
 
 
 
Pretax compensation expense
$
7.1

 
$
7.4

Income tax benefit
(1.5
)
 
(2.5
)
Stock Award expense, net of income taxes
5.6

 
4.9

Stock options:
 
 
 
Pretax compensation expense
4.8

 
4.6

Income tax benefit
(1.0
)
 
(1.6
)
Stock option expense, net of income taxes
3.8

 
3.0

Total stock-based compensation:
 
 
 
Pretax compensation expense
11.9

 
12.0

Income tax benefit
(2.5
)
 
(4.1
)
Total stock-based compensation expense, net of income taxes
$
9.4

 
$
7.9
Schedule of Future Compensation
Future compensation amounts will be adjusted for any changes in estimated forfeitures ($ in millions):
Stock Awards
$
66.8

Stock options
61.6

Total unrecognized compensation cost
$
128.4