Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Commercial paper program
Short-term Debt [Line Items]
Average outstanding balances	$ 4,100.0	$ 4,600.0
Weighted average interest rates	5.30%	2.30%
Weighted average maturity (approximately in days)	2 days	2 days
Reverse repurchase agreements
Short-term Debt [Line Items]
Average outstanding balances	$ 1,379.0	$ 1,119.4
Weighted average interest rates	5.30%	2.40%