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Income Taxes - (Details) - ASU 2016-09 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Net discrete tax benefits (expenses) for equity-based compensation | $ (0.2) |  | $ (0.5) | $ 6.8
Effective income tax rate (as a percent) |  |  | 30.10% | 8.70%
Effective income tax rate excluding certain discrete tax items (as a percent) | 33.70% | 3.40% |  |
Return-to-provision true-up adjustments | $ 2.2 | $ 5.1 | $ 2.3 | $ 12.0
Provision true-up adjustment | $ 2.4 |  | $ 2.8 | $ 5.2

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