Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Commercial paper program
Short-term Debt [Line Items]
Average outstanding balances	$ 1,500.0	$ 1,200.0	$ 3,200.0	$ 1,700.0
Weighted average interest rates	4.50%	0.10%	3.10%	0.10%
Weighted average maturity (approximately in days)	1 day	1 day	2 days	1 day
Reverse repurchase agreements
Short-term Debt [Line Items]
Average outstanding balances	$ 343.2	$ 93.2	$ 811.2	$ 172.8
Weighted average interest rates	4.40%	0.30%	3.10%	0.20%