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Restructuring and Impairment Activities (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 and December 31, 2018 are summarized as follows ($ in millions):
 
Six Months Ended
 
Year Ended
 
June 30,
2019
 
December 31,
2018
Balance at beginning of year
$
1.4

 
$
1.7

Accruals for announced programs
0.4

 
1.3

Cash payments
(1.0
)
 
(3.3
)
Other
—

 
1.8

Exchange rate impacts
—

 
(0.1
)
Balance at end of period
$
0.8

 
$
1.4