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Restructuring and Asset Impairment Charges (Tables)
 3 Months Ended
Sep. 30, 2021
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
The reserve balances and activity for restructuring charges at September 30, 2021 and June 30, 2021 were as follows:

($ in millions)September 30, 2021June 30, 2021
Reserve balance at beginning of period$1.4 $9.5 
Restructuring charges excluding non-cash impairments— 1.2 
Cash payments(1.1)(9.3)
Reserve balance at end of period$0.3 $1.4