Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Commercial paper program
Short-term Debt [Line Items]
Average outstanding balances	$ 3,400.0	$ 1,900.0	$ 4,000.0	$ 1,900.0
Weighted average interest rates	3.50%	0.10%	2.80%	0.10%
Weighted average maturity (approximately in days)	2 days	1 day	2 days	1 day
Reverse repurchase agreements
Short-term Debt [Line Items]
Average outstanding balances	$ 960.8	$ 228.4	$ 1,040.1	$ 211.7
Weighted average interest rates	3.40%	0.20%	2.90%	0.20%