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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 145.2 $ (34.9) $ (380.1)
Other comprehensive income (loss):      
Net foreign currency translation adjustment 9.0 0.6 7.0
Net unrealized gain (loss) on derivative instruments, net of tax 2.9 (7.9) 4.2
Reclassification of net unrealized gain on derivative instruments to net income (loss), net of tax (7.4) (7.3) (17.4)
Net unrealized loss on securities, net of tax (3.5) (40.4) (34.9)
Reclassification of net unrealized loss on securities to net income (loss), net of tax 0.0 64.6 76.0
Net unrealized loss on pension and other post-retirement benefits, net of tax (5.0) (2.1) (1.8)
Pension and other post-retirement benefit adjustments, net of tax 1.6 (2.0) (1.3)
Total other comprehensive income (loss) (2.4) 5.5 31.8
Comprehensive income (loss) $ 142.8 $ (29.4) $ (348.3)