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Restructuring and Impairment Activities (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2017 and December 31, 2016 are summarized as follows ($ in millions):
 
Three Months Ended
 
Year Ended
 
March 31,
2017
 
December 31,
2016
Balance at beginning of year
$
4.3

 
$
7.7

Accruals for announced programs
1.1

 
4.3

Cash payments
(1.5
)
 
(8.4
)
Exchange rate impacts
0.1

 
0.7

Balance at end of period
$
4.0

 
$
4.3