Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Commercial paper program
Short-term Debt [Line Items]
Average outstanding balances	$ 2,700.0	$ 1,500.0	$ 3,600.0	$ 3,200.0
Weighted average interest rates	5.40%	4.50%	5.30%	3.10%
Weighted average maturity (approximately in days)	2 days	1 day	2 days	2 days
Reverse repurchase agreements
Short-term Debt [Line Items]
Average outstanding balances	$ 634.4	$ 343.2	$ 1,482.0	$ 811.2
Weighted average interest rates	5.40%	4.40%	5.40%	3.10%