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Income Taxes - (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Effective income tax rate excluding certain discrete tax items (as a percent) | 27.50% | 27.70% | 27.50% | 27.80%
ASU 2016-09 |  |  |  |
Discrete tax benefits (expenses) for equity-based compensation | $ (0.3) | $ 0.7 | $ (0.1) | $ 6.9
Effective income tax rate (as a percent) | 28.60% | 25.30% | 27.70% | 13.50%

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