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DERIVATIVE FINANCIAL INSTRUMENTS - Derivative Instruments, Loss (Gain) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized (gain) loss on derivatives	$ (25.6)	$ 11.8	$ (28.9)	$ 12.5
Realized loss (gain) on derivatives	2.0	(1.4)	7.1	(2.9)
Total (gain) loss on derivatives	$ (23.6)	$ 10.4	$ (21.8)	$ 9.6

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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