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Fair Value Measurements - Carrying Value and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jun. 30, 2019
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt with fixed interest rates (excluding commercial paper and capital leases) | $ 2,539.4 | $ 2,955.6
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total long-term debt with fixed interest rates (excluding commercial paper and capital leases) | $ 2,640.6 | $ 3,041.3

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- Details
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