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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes |  |  |
Tax act, provisional income tax benefit |  | $ 68.1 |
Tax credit carryforward amount subject to expiration | $ 36.9 |  |
Undistributed earnings of international subsidiaries | 4.4 |  |
Reserve on unrecognized tax benefits that would benefit the effective tax rate | 2.2 |  |
Interest and penalties | 0.1 | $ 0.1 | $ 0.1
Accrued interest and penalties related to unrecognized tax benefits | 1.2 |  |
Expiring from 2030 to 2039 |  |  |
Income Taxes |  |  |
Tax credit carryforward amount subject to expiration | 35.7 |  |
Expiring from 2020 to 2029 |  |  |
Income Taxes |  |  |
Tax credit carryforward amount subject to expiration | 0.5 |  |
Tax Credit Carryforward, Without Expiration |  |  |
Income Taxes |  |  |
Tax credit carryforward amount subject to expiration | 0.7 |  |
Domestic Tax Authority |  |  |
Income Taxes |  |  |
Operating loss carryforwards | 31.4 |  |
Operating loss carryforwards, subject to expiration | 13.1 |  |
Operating loss carryforwards, not subject to expiration | 18.3 |  |
State and Local Jurisdiction |  |  |
Income Taxes |  |  |
Operating loss carryforwards | 13.4 |  |
Foreign Tax Authority | Canada Revenue Agency |  |  |
Income Taxes |  |  |
Operating loss carryforwards | 2.8 |  |
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) |  |  |
Income Taxes |  |  |
Operating loss carryforwards | $ 0.6 |  |

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