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Income Taxes - (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Effective income tax rate (as a percent) | (3.40%) | 26.00% | 8.70% | 24.20%
Effective income tax rate excluding certain discrete tax items (as a percent) | 23.70% | 28.60% | 26.70% | 28.40%
ASU 2016-09 |  |  |  |
Excess tax benefits from employee stock compensation benefit | $ 5.1 | $ 0.7 | $ 12.0 | $ 2.6

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