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Summary of Significant Accounting Policies - Fair Value Measurement (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Jun. 30, 2025
--- | --- | ---
Assets and liabilities measured at fair value |  |
Equity securities | $ 42.3 | $ 19.9
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets and liabilities measured at fair value |  |
Estimated fair value of marketable securities | 12.9 |
Equity securities | 42.3 |
Significant Other Observable Inputs (Level 2) |  |
Assets and liabilities measured at fair value |  |
Estimated fair value of long-term debt | 747.6 |
Estimated fair value of marketable securities | $ 266.2 |

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