Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Commercial paper program
Short-term Debt [Line Items]
Average outstanding balances	$ 1,200.0	$ 700.0	$ 1,700.0	$ 1,600.0
Weighted average interest rates	0.10%	0.10%	0.10%	0.10%
Weighted average maturity (approximately in days)	1 day	1 day	1 day	1 day
Reverse repurchase agreements
Short-term Debt [Line Items]
Average outstanding balances	$ 93.2	$ 54.9	$ 172.8	$ 97.1
Weighted average interest rates	0.30%	0.20%	0.20%	0.30%