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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (380.1) $ (437.5) $ 513.4
Other comprehensive income (loss):      
Net foreign currency translation adjustment 7.0 (27.2) 4.5
Net unrealized gain (loss) on derivative instruments, net of tax 4.2 29.9 19.8
Reclassification of net unrealized (gain) loss on derivative instruments to net income (loss), net of tax (17.4) (6.8) 5.4
Net unrealized loss on securities, net of tax (34.9) (77.4) (2.3)
Reclassification of net unrealized loss on securities to net income (loss), net of tax 76.0 0.0 0.0
Net unrealized gain (loss) in pension and other post-retirement benefits, net of tax (1.8) (5.4) 5.1
Pension and other post-retirement benefit adjustments, net of tax (1.3) 8.7 0.3
Total other comprehensive income (loss) 31.8 (78.2) 32.8
Comprehensive income (loss) (348.3) (515.7) 546.2
Comprehensive income attributable to noncontrolling interest 0.0 0.0 (0.9)
Comprehensive income (loss) attributable to controlling interest $ (348.3) $ (515.7) $ 545.3