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Restructuring and Impairment Activities (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31, 2018 and December 31, 2017 are summarized as follows ($ in millions):
 
Three Months Ended
 
Year Ended
 
March 31,
2018
 
December 31,
2017
Balance at beginning of year
$
1.7

 
$
4.3

Accruals for announced programs
0.4

 
3.5

Cash payments
(0.6
)
 
(6.4
)
Other
1.8

 
—

Exchange rate impacts
0.1

 
0.3

Balance at end of period
$
3.4

 
$
1.7