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DEBT - Schedule of Debt Repurchase Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Debt Instrument [Line Items] |  |  |
Gain on Early Extinguishment | $ 2.6 | $ (3.0) | $ 0.0
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 180.1 | 61.4 |
Amounts Paid | 172.9 | 52.7 |
Unamortized Debt Issuance Costs | 2.5 | 0.8 |
Gain on Early Extinguishment | 4.7 | 7.9 |
2029 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 284.2 |  |
Amounts Paid | 284.2 |  |
Unamortized Debt Issuance Costs | 2.9 |  |
Gain on Early Extinguishment | (2.9) |  |
2029 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 8.1 | 2.8 |
Amounts Paid | 7.8 | 2.6 |
Unamortized Debt Issuance Costs | 0.1 | 0.0 |
Gain on Early Extinguishment | 0.2 | 0.2 |
2030 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 142.5 |  |
Amounts Paid | 142.5 |  |
Unamortized Debt Issuance Costs | 2.0 |  |
Gain on Early Extinguishment | (2.0) |  |
2030 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 132.8 | 11.5 |
Amounts Paid | 130.5 | 10.7 |
Unamortized Debt Issuance Costs | 2.0 | 0.2 |
Gain on Early Extinguishment | 0.3 | 0.6 |
2031 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 285.7 |  |
Amounts Paid | 277.7 |  |
Unamortized Debt Issuance Costs | 3.0 |  |
Gain on Early Extinguishment | 5.0 |  |
2031 Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Amounts Repurchased | 39.2 | 47.1 |
Amounts Paid | 34.6 | 39.4 |
Unamortized Debt Issuance Costs | 0.4 | 0.6 |
Gain on Early Extinguishment | $ 4.2 | $ 7.1 |

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