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Restructuring Activities (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and December 31, 2014 are summarized as follows ($ in millions):
 
Nine Months Ended
 
Year Ended
 
September 30,
2015
 
December 31,
2014
Balance at beginning of year
$
8.7

 
$
4.7

Accruals for announced programs
7.2

 
11.2

Cash payments
(6.8
)
 
(6.3
)
Exchange rate impacts
(0.5
)
 
(0.9
)
Balance at end of period
$
8.6

 
$
8.7