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Short-Term Financing - Commercial Paper and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions | 12 Months Ended
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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%

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