Short-Term Financing - Commercial Paper and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Commercial Paper
Short-term Debt [Line Items]
Short-term debt, average outstanding amount	$ 1,600.0	$ 2,700.0
Weighted average interest rates	0.10%	1.60%
Weighted average maturity (approximately in days)	1 day	2 days
Reverse Repurchase Agreements
Short-term Debt [Line Items]
Short-term debt, average outstanding amount	$ 136.7	$ 263.4
Weighted average interest rates	0.20%	1.60%