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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Effective tax rate, percent |  |  |  | 30.30% | 45.30% |  |
Corporate tax rate | 21.00% | 35.00% |  | 24.50% |  |  |
Tax expense |  |  | $ 0.6 | $ 36.7 |  | $ 3.0 |
Transition tax |  |  |  |  |  |  | $ 30.0
State and Local Jurisdiction |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Tax expense |  |  |  | $ 0.7 |  |  |

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