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Restructuring and Asset Impairment Charges (Tables)
 12 Months Ended
Jun. 30, 2025
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Charges
The reserve balances and activity for restructuring charges at June 30, 2025 and 2024 were as follows:

 June 30,
($ in millions)20252024
Reserve balance beginning of year$1.1 $— 
Restructuring charges excluding noncash impairments1.1 1.1 
Cash payments(2.2)— 
Reserve balance end of year$— $1.1