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Share-Based Payments
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shared-Based Payments
Expense Recognition
The following table provides share-based compensation expense in 2015, 2014, and 2013:
($ in millions)
2015
 
2014
 
2013
Share-based compensation expense, pre-tax
$
23.8

 
18.6

 
19.9

Income tax benefit
(8.0
)
 
(6.2
)
 
(6.8
)
Share-based compensation expense, after-tax
$
15.8

 
12.4

 
13.1