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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Statement of Comprehensive Income [Abstract] |  |  |  |
Net derivative gains (losses) and other costs arising during the period, net of tax expense (benefit) | $ 0.8 | $ 5.8 | $ 0.0 | $ 6.2
Reclassification of (gains) into net income (loss), net of tax (expense) | $ (0.8) | $ (0.5) | $ (2.3) | $ (1.5)

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