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Summary of Significant Accounting Policies - Fair Value Measurement (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Jun. 30, 2024
Assets and liabilities measured at fair value    
Estimated fair value of long-term debt $ 1,012.8  
Estimated fair value of marketable securities 226.2  
Measured on a recurring basis    
Assets and liabilities measured at fair value    
Assets, Fair Value Disclosure 0.0 $ 0.0
Liabilities, Fair Value Disclosure $ 0.0 $ 0.0