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Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Commercial paper program |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt, average outstanding amount | $ 1,800.0 | $ 3,500.0 | $ 2,100.0 | $ 3,700.0
Debt instrument, interest rate during period | 0.10% | 1.70% | 0.10% | 2.00%
Commercial paper weighted average maturity | 1 day | 2 days | 1 day | 2 days
Reverse repurchase agreements |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term debt, average outstanding amount | $ 83.2 | $ 335.9 | $ 117.8 | $ 381.2
Debt instrument, interest rate during period | 0.30% | 1.70% | 0.30% | 1.80%

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