Fair Value Measurements - Carrying Value and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
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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