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Restructuring Activities (Tables)
 6 Months Ended
Jun. 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 June 30, 2014 and December 31, 2013 are summarized as follows ($ in millions):
 
Six Months Ended
 
Year Ended
 
June 30,
2014
 
December 31,
2013
Balance at beginning of year
$
4.7

 
$
3.4

Accruals for announced programs
3.3

 
3.9

Cash payments
(2.4
)
 
(2.7
)
Exchange rate impacts
—

 
0.1

Balance at end of period
$
5.6

 
$
4.7