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Restructuring and Impairment Activities (Tables)
 12 Months Ended
Dec. 31, 2013
Restructuring and Related Activities [Abstract]  
Changes in restructuring liabilities
Changes in the restructuring liabilities, substantially all of which are employee-related, are summarized as follows ($ in millions):
 
2013
 
2012
Balance at beginning of year
$
3.4

 
$
7.3

Accruals for announced programs
3.9

 
2.6

Cash payments
(2.7
)
 
(6.4
)
Exchange rate impacts
0.1

 
(0.1
)
Balance at end of period
$
4.7

 
$
3.4