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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Goodwill and Other Intangible Assets) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss |  |  | $ 675.0 | $ 1,227.0 |
GMPD |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Discount Rate, fair value inputs | 2.00% |  |  |  |
Goodwill impairment loss | $ 90.0 | $ 585.0 | $ 675.0 | $ 1,227.0 | $ 2,100.0
Minimum |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Discount Rate, fair value inputs |  |  | 10.00% |  |
Maximum |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Discount Rate, fair value inputs |  |  | 11.50% |  |

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