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Restructuring and Impairment Activities (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
2017
 
2016
Balance at beginning of year
$
4.3

 
$
7.7

Accruals for announced programs
3.5

 
4.3

Cash payments
(6.4
)
 
(8.4
)
Exchange rate impacts
0.3

 
0.7

Balance at end of period
$
1.7

 
$
4.3