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EQUITY - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | $ (6.6) | $ (53.2) | $ (24.8)
Amounts reclassified from accumulated other comprehensive net income (loss) | 1.7 | 52.2 | 76.4
Income tax benefit (expense) | 2.6 | 6.5 | (19.8)
Net current period other comprehensive income (loss) | (2.4) | 5.5 | 31.8
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (107.3) | (112.8) | (144.6)
Equity ending balance | (109.7) | (107.3) | (112.8)
Foreign Currency Translation Adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (21.3) | (21.9) | (28.9)
Other comprehensive income (loss) before reclassifications | (0.5) | 0.6 | 7.0
Amounts reclassified from accumulated other comprehensive net income (loss) | 9.5 | 0.0 | 0.0
Income tax benefit (expense) | 0.0 | 0.0 | 0.0
Net current period other comprehensive income (loss) | 9.0 | 0.6 | 7.0
Equity ending balance | (12.2) | (21.3) | (21.9)
Net Unrealized Gain (Loss) On Derivative Instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | 4.9 | 20.1 | 33.3
Other comprehensive income (loss) before reclassifications | 3.9 | (10.6) | 5.6
Amounts reclassified from accumulated other comprehensive net income (loss) | (9.9) | (9.7) | (23.3)
Income tax benefit (expense) | 1.5 | 5.1 | 4.5
Net current period other comprehensive income (loss) | (4.5) | (15.2) | (13.2)
Equity ending balance | 0.3 | 4.9 | 20.1
Net Unrealized Loss On Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (14.4) | (38.6) | (79.7)
Other comprehensive income (loss) before reclassifications | (3.5) | (40.4) | (34.9)
Amounts reclassified from accumulated other comprehensive net income (loss) | 0.0 | 64.6 | 101.3
Income tax benefit (expense) | 0.0 | 0.0 | (25.3)
Net current period other comprehensive income (loss) | (3.5) | 24.2 | 41.1
Equity ending balance | (17.9) | (14.4) | (38.6)
Pension and Other Post- Retirement Benefit Adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (76.5) | (72.4) | (69.3)
Other comprehensive income (loss) before reclassifications | (6.5) | (2.8) | (2.5)
Amounts reclassified from accumulated other comprehensive net income (loss) | 2.1 | (2.7) | (1.6)
Income tax benefit (expense) | 1.1 | 1.4 | 1.0
Net current period other comprehensive income (loss) | (3.4) | (4.1) | (3.1)
Equity ending balance | $ (79.9) | $ (76.5) | $ (72.4)

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