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Restructuring Activities (Tables)
 6 Months Ended
Jun. 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 June 30, 2015 and December 31, 2014 are summarized as follows ($ in millions):
 
Six Months Ended
 
Year Ended
 
June 30,
2015
 
December 31,
2014
Balance at beginning of year
$
8.7

 
$
4.7

Accruals for announced programs
5.9

 
11.2

Cash payments
(4.3
)
 
(6.3
)
Exchange rate impacts
(0.7
)
 
(0.9
)
Balance at end of period
$
9.6

 
$
8.7