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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Taxes [Line Items] |  |  |  |
Gross increase – tax positions in prior period | $ 77.5 | $ 21.5 | $ 84.4 |
Income tax credits and adjustments |  |  | 3.2 |
Mandatory repatriation tax payable period | 8 years |  |  |
Repatriation tax liability | $ 11.1 |  |  |
Repatriation tax liability due and payable in the next 12 months, will be offset | 5.2 |  |  |
Taxes on unremitted foreign earnings | 1.7 | 1.2 |  |
Undistributed foreign earnings were taxed in the U.S. | 500.6 |  |  |
Tax reform act, income tax expense (benefit) | 23.9 |  |  |
Undistributed foreign earnings, high-tax exceptions | 53.5 |  |  |
Undistributed foreign earnings, taxed | 183.1 |  |  |
Operating loss carryforwards, domestic | 119.5 |  |  |
U.S. state net operating loss carryforwards | 42.8 |  |  |
Operating loss carryforwards, foreign | 114.6 |  |  |
Deferred tax assets, valuation allowance | 321.4 | 333.4 | 337.4 |
Increase (decrease) in valuation allowance, deferred tax asset | (12.0) | (4.0) |  |
Unrecognized tax benefits | 190.2 | 121.1 | 100.9 | $ 18.0
Unrecognized tax benefits that would impact effective tax rate | 102.1 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 9.8 | 1.7 |  |
Increase (decrease) in unrecognized tax benefits, income tax penalties and interest expense | 8.1 | 0.3 | 0.1 |
Unrecognized tax benefits, decrease resulting from prior period tax positions | 9.2 | 34.4 | 2.9 |
Unrecognized tax benefits, increase resulting from current period tax positions | 1.7 | 33.4 | 1.7 |
Tax Year 2019 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Gross increase – tax positions in prior period |  |  | 67.3 |
Unrecognized tax benefits, decrease resulting from prior period tax positions |  | 33.0 |  |
Unrecognized tax benefits, decrease resulting from current period tax positions | 2.3 |  |  |
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities | 17.9 |  |  |
Federal Net Operating Losses |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. federal operating loss carryforwards expected to expire unused | 561.2 |  |  |
Tax benefit related to NOLs expire unused | 117.8 |  |  |
U.S. State Net Operating Losses |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax benefit related to NOLs expire unused | 13.8 |  |  |
Deferred tax assets, valuation allowance | 42.3 |  |  |
Foreign Net Operating Losses |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax benefit related to NOLs expire unused | 112.4 |  |  |
U.S. Net Deferred Tax Assets |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 203.6 | 244.7 | 257.5 |
Increase (decrease) in valuation allowance, deferred tax asset | (41.1) | (12.8) |  |
Foreign Net Deferred Tax Assets |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred tax assets, valuation allowance | 117.8 | 88.7 | $ 79.9 |
Increase (decrease) in valuation allowance, deferred tax asset | 29.1 | 8.8 |  |
HHI Segment |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits, increase resulting from current period tax positions | 50.1 | 27.3 |  |
Domestic Tax Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | 569.2 |  |  |
Foreign Tax Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | $ 458.7 |  |  |
June 2019 Regulations |  |  |  |
Income Taxes [Line Items] |  |  |  |
Gross increase – tax positions in prior period |  | $ 59.0 |  |

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