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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 14.0 $ 46.3 $ (41.6)
Net derivative gains (losses) and other costs arising during the period, net of tax expense (benefit) of $1.7; $0.8; and $(3.6), respectively 4.2 2.1 (9.4)
Reclassification of (gains) losses into net income (loss), net of tax (expense) benefit of $(0.3); $(1.2); and $5.1, respectively (0.7) 3.3 14.2
Other comprehensive income 3.5 5.4 4.8
Comprehensive income (loss) $ 17.5 $ 51.7 $ (36.8)