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Restructuring and Asset Impairment Charges (Tables)
 12 Months Ended
Jun. 30, 2024
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Charges
The reserve balances and activity for restructuring charges at June 30, 2024 and 2023 were as follows:

 June 30,
($ in millions)20242023
Reserve balance beginning of year$— $— 
Restructuring charges excluding noncash impairments1.1 — 
Cash payments— — 
Reserve balance end of year$1.1 $—