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%