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Restructuring and Impairment Activities (Tables)
 12 Months Ended
Dec. 31, 2016
Restructuring and Related Activities [Abstract]  
Changes in Restructuring Liabilities
Changes in the restructuring liabilities, substantially all of which are employee-related, are summarized as follows ($ in millions):
 
2016
 
2015
Balance at beginning of year
$
7.7

 
$
8.7

Accruals for announced programs
4.3

 
8.0

Cash payments
(8.4
)
 
(8.3
)
Exchange rate impacts
0.7

 
(0.7
)
Balance at end of period
$
4.3

 
$
7.7