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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)