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Restructuring and Impairment Activities (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and December 31, 2015 are summarized as follows ($ in millions):
 
Nine Months Ended
 
Year Ended
 
September 30,
2016
 
December 31,
2015
Balance at beginning of year
$
7.7

 
$
8.7

Accruals for announced programs
3.5

 
8.0

Cash payments
(6.7
)
 
(8.3
)
Exchange rate impacts
0.5

 
(0.7
)
Balance at end of period
$
5.0

 
$
7.7