Short-Term Financing - Commercial Paper and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Commercial Paper
Short-term Debt [Line Items]
Short-term debt, average outstanding amount	$ 3,500.0	$ 3,400.0
Weighted average interest rates	5.30%	3.70%
Weighted average maturity (approximately in days)	2 days	2 days
Reverse Repurchase Agreements
Short-term Debt [Line Items]
Short-term debt, average outstanding amount	$ 1,828.6	$ 1,279.9
Weighted average interest rates	5.50%	4.30%