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Restructuring Activities (Tables)
 9 Months Ended
Sep. 30, 2014
Restructuring and Related Activities [Abstract]  
Changes in restructuring liabilities
Changes in the restructuring liabilities, substantially all of which are employee-related, during the periods ended September 30, 2014 and December 31, 2013 are summarized as follows ($ in millions):
 
Nine Months Ended
 
Year Ended
 
September 30,
2014
 
December 31,
2013
Balance at beginning of year
$
4.7

 
$
3.4

Accruals for announced programs
5.8

 
3.9

Cash payments
(3.5
)
 
(2.7
)
Exchange rate impacts
(0.4
)
 
0.1

Balance at end of period
$
6.6

 
$
4.7