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Restructuring and Impairment Activities (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and December 31, 2016 are summarized as follows ($ in millions):
 
Six Months Ended
 
Year Ended
 
June 30,
2017
 
December 31,
2016
Balance at beginning of year
$
4.3

 
$
7.7

Accruals for announced programs
2.1

 
4.3

Cash payments
(3.0
)
 
(8.4
)
Exchange rate impacts
0.2

 
0.7

Balance at end of period
$
3.6

 
$
4.3