Goodwill and Other Intangible Assets (Schedule of Goodwill by Reportable Segment) (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 [Roll Forward]
Beginning balance		$ 4,613.0	$ 4,613.0	$ 5,856.0
Goodwill, Acquired During Period			790.0	15.0
Foreign currency translation adjustments and other			3.0	7.0
Disposal Group, Including Discontinued Operation, Goodwill				(24.0)
Goodwill impairment loss			675.0	1,227.0
Ending balance			4,725.0	4,613.0	$ 5,856.0
OptiFreight Logistics
Goodwill [Roll Forward]
Ending balance			48.0
GMPD
Goodwill [Roll Forward]
Beginning balance		681.0	681.0	1,899.0
Goodwill, Acquired During Period			(3.0)	15.0
Foreign currency translation adjustments and other			3.0	6.0
Disposal Group, Including Discontinued Operation, Goodwill				0.0
Goodwill impairment loss	$ 90.0	585.0	675.0	1,227.0	2,100.0
Ending balance			0.0	681.0	1,899.0
Accumulated goodwill impairment loss			5,400.0	4,700.0
Other Operating Segment
Goodwill [Roll Forward]
Beginning balance		1,170.0	1,170.0	1,170.0
Goodwill, Acquired During Period			0.0	0.0
Foreign currency translation adjustments and other			0.0	0.0
Disposal Group, Including Discontinued Operation, Goodwill				0.0
Goodwill impairment loss			0.0	0.0
Ending balance			1,170.0	1,170.0	1,170.0
Accumulated goodwill impairment loss			829.0	829.0
Goodwill, Transfers				110.0
Pharmaceutical and Specialty Solutions
Goodwill [Roll Forward]
Beginning balance		$ 2,762.0	2,762.0	2,787.0
Goodwill, Acquired During Period			793.0	0.0
Foreign currency translation adjustments and other			0.0	1.0
Disposal Group, Including Discontinued Operation, Goodwill				(24.0)
Goodwill impairment loss			0.0	0.0
Ending balance			$ 3,555.0	2,762.0	$ 2,787.0
Goodwill, Transfers				(110.0)
Pharmaceutical and Specialty Solutions | Outcomes Divestiture
Goodwill [Roll Forward]
Disposal Group, Including Discontinued Operation, Goodwill				$ (24.0)