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Restructuring and Impairment Activities (Tables)
 6 Months Ended
Jun. 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 June 30, 2016 and December 31, 2015 are summarized as follows ($ in millions):
 
Six Months Ended
 
Year Ended
 
June 30,
2016
 
December 31,
2015
Balance at beginning of year
$
7.7

 
$
8.7

Accruals for announced programs
2.2

 
8.0

Cash payments
(5.1
)
 
(8.3
)
Exchange rate impacts
0.2

 
(0.7
)
Balance at end of period
$
5.0

 
$
7.7