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Restructuring and Impairment Activities (Tables)
12 Months Ended
Dec. 31, 2018
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):
 
2018
 
2017
Balance at beginning of year
$
1.7

 
$
4.3

Accruals for announced programs
1.3

 
3.5

Cash payments
(3.3
)
 
(6.4
)
Other
1.8

 

Exchange rate impacts
(0.1
)
 
0.3

Balance at end of period
$
1.4

 
$
1.7