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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 29, 2019
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 29, 2019
 
March 30, 2018
Stock Awards:
 
 
 
Pretax compensation expense
$
7.8

 
$
6.5

Income tax benefit
(1.7
)
 
(1.4
)
Stock Award expense, net of income taxes
6.1

 
5.1

Stock options:
 
 
 
Pretax compensation expense
5.1

 
4.5

Income tax benefit
(1.1
)
 
(0.9
)
Stock option expense, net of income taxes
4.0

 
3.6

Total stock-based compensation:
 
 
 
Pretax compensation expense
12.9

 
11.0

Income tax benefit
(2.8
)
 
(2.3
)
Total stock-based compensation expense, net of income taxes
$
10.1

 
$
8.7
Schedule of Future Compensation Future compensation amounts will be adjusted for any changes in estimated forfeitures ($ in millions):
Stock Awards
$
77.2

Stock options
70.4

Total unrecognized compensation cost
$
147.6