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Segment Information (Assets by Reportable Segment) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Segment Reporting Information [Line Items]
Total assets			$ 45,121.0	$ 43,349.0
Goodwill impairment loss			$ 675.0	1,227.0
Number of Reportable Segments | segment			2
GMPD
Segment Reporting Information [Line Items]
Goodwill impairment loss	$ 90.0	$ 585.0	$ 675.0	1,227.0	$ 2,100.0
Other Operating Segment
Segment Reporting Information [Line Items]
Goodwill impairment loss			0.0	0.0
Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Goodwill impairment loss			0.0	0.0
Operating Segments | GMPD
Segment Reporting Information [Line Items]
Total assets			7,047.0	7,903.0
Operating Segments | Other Operating Segment
Segment Reporting Information [Line Items]
Total assets			2,606.0	2,514.0
Operating Segments | Pharmaceutical and Specialty Solutions
Segment Reporting Information [Line Items]
Total assets			29,149.0	27,715.0
Total operating earnings/(loss)
Segment Reporting Information [Line Items]
Total assets			$ 6,319.0	$ 5,217.0

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