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Restructuring and Asset Impairment Charges (Tables)
 6 Months Ended
Dec. 31, 2016
Restructuring and Related Activities [Abstract]  
Schedule of activity and reserve balances for restructuring
Activity and reserve balances for restructuring charges were as follows:

($ in millions)
 
 
Reserve balance at June 30, 2015
 
$
2.3

Restructuring and asset impairment charges
 
18.0

Payments from qualified pension plan associated with restructuring charges
 
(9.4
)
Cash payments
 
(3.0
)
Non-cash asset impairment charges and other
 
(7.6
)
Reserve balance at June 30, 2016
 
0.3

Cash payments
 
(0.3
)
Reserve balance at December 31, 2016
 
$
—