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DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Aug. 13, 2021 | Mar. 17, 2021 | Oct. 22, 2019 | Dec. 15, 2016
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 2,119.7 | $ 2,242.8 |  |  |  |
Finance lease obligations | 14.5 | 17.8 |  |  |  |
Less current portions | 57.2 | 52.6 |  |  |  |
Long-term debt | 2,049.2 | 2,174.2 |  |  |  |
Credit Facilities | Term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | 500.0 | 625.0 |  |  |  |
Senior Notes | Senior Notes due 2031 – 4.000% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 500.0 | $ 500.0 |  |  |  |
Interest rate (percent) | 4.00% | 4.00% |  | 4.00% |  |
Senior Notes | Senior Notes due 2032 – 4.375% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 400.0 | $ 400.0 |  |  |  |
Interest rate (percent) | 4.375% | 4.375% | 4.375% |  |  |
Senior Notes | Senior Notes due 2029 - 4.500% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 450.0 | $ 450.0 |  |  |  |
Interest rate (percent) | 4.50% | 4.50% |  |  | 4.50% |
Senior Notes | Senior Notes due 2026 – 5.250% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 250.0 | $ 250.0 |  |  |  |
Interest rate (percent) | 5.25% | 5.25% |  |  |  | 5.25%
Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 5.2 | $ 0.0 |  |  |  |
Long-term Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less unamortized debt issuance costs | $ 13.3 | $ 16.0 |  |  |  |

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