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EQUITY - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | $ (24.8) | $ (96.4) | $ 35.1
Amounts reclassified from accumulated other comprehensive net income (loss) | 76.4 | 2.6 | 7.7
Income tax benefit (expense) | (19.8) | 15.6 | (10.0)
Net current period other comprehensive income (loss) | 31.8 | (78.2) | 32.8
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (144.6) | (66.4) | (99.1)
Equity ending balance | (112.8) | (144.6) | (66.4)
Foreign Currency Translation Adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (28.9) | (1.7) | (6.2)
Other comprehensive income (loss) before reclassifications | 7.0 | (27.2) | 4.5
Amounts reclassified from accumulated other comprehensive net income (loss) | 0.0 | 0.0 | 0.0
Income tax benefit (expense) | 0.0 | 0.0 | 0.0
Net current period other comprehensive income (loss) | 7.0 | (27.2) | 4.5
Equity ending balance | (21.9) | (28.9) | (1.7)
Net Unrealized Gain (Loss) On Derivative Instruments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | 33.3 | 10.2 | (15.1)
Other comprehensive income (loss) before reclassifications | 5.6 | 40.1 | 26.8
Amounts reclassified from accumulated other comprehensive net income (loss) | (23.3) | (9.1) | 7.3
Income tax benefit (expense) | 4.5 | (7.9) | (8.9)
Net current period other comprehensive income (loss) | (13.2) | 23.1 | 25.2
Equity ending balance | 20.1 | 33.3 | 10.2
Net Unrealized Loss On Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (79.7) | (2.3) | 0.0
Other comprehensive income (loss) before reclassifications | (34.9) | (102.0) | (3.1)
Amounts reclassified from accumulated other comprehensive net income (loss) | 101.3 | 0.0 | 0.0
Income tax benefit (expense) | (25.3) | 24.6 | 0.8
Net current period other comprehensive income (loss) | 41.1 | (77.4) | (2.3)
Equity ending balance | (38.6) | (79.7) | (2.3)
Pension and Other Post- Retirement Benefit Adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Equity beginning balance | (69.3) | (72.5) | (77.8)
Other comprehensive income (loss) before reclassifications | (2.5) | (7.3) | 6.9
Amounts reclassified from accumulated other comprehensive net income (loss) | (1.6) | 11.7 | 0.4
Income tax benefit (expense) | 1.0 | (1.1) | (1.9)
Net current period other comprehensive income (loss) | (3.1) | 3.3 | 5.4
Equity ending balance | $ (72.4) | $ (69.3) | $ (72.5)

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