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PROPERTY, PLANT AND EQUIPMENT - Depreciation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Property, Plant and Equipment |  |  |  |
Depreciation | $ 141.9 | $ 143.1 | $ 423.6 | $ 430.0
Abandonments | $ 1.4 | $ 7.0 | 6.8 | $ 22.5
Increase in depreciation expense in next three months |  |  | 0.7 |
Decrease in depreciation expense in year 2020 |  |  | 0.8 |
Decrease in depreciation expense in year 2021 |  |  | 0.8 |
Decrease in depreciation expense in year 2022 |  |  | 0.6 |
Decrease in depreciation expense in year 2023 |  |  | 0.3 |
Decrease in depreciation expense in year 2024 |  |  | 0.3 |
Decrease in depreciation expense thereafter |  |  | 0.5 |
Rigs components depreciation |  |  |  |
Property, Plant and Equipment |  |  |  |
Increase in depreciation |  |  | $ 4.5 |

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- Definition Amount of increase (decrease) in depreciation expense due to the change in estimated useful life for property, plant, and equipment with a finite life expected to be recognized after the sixth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of increase (decrease) in depreciation expense due to the change in estimated useful life for property, plant, and equipment with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of increase (decrease) in depreciation expense due to the change in estimated useful life for property plant and equipment with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. + References No definition available. + Details
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