v3.25.2
Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Financial Statement Related Disclosures [Line Items]        
Government assistance, production credit $ 112.4      
Government assistance, production credit, current period 33.9   $ 33.9  
Government assistance, production credit, retroactive adjustment $ 78.5   $ 78.5  
Effective tax rate, percent 6.50% 23.80% 11.50% (66.70%)
Impairment of intangible assets $ 0.0 $ 110.6 $ 0.0 $ 110.6
Foreign currency exchange gain (loss) $ 2.0 $ (0.3) (1.4) 29.3
ARGENTINA        
Financial Statement Related Disclosures [Line Items]        
Foreign currency exchange gain (loss)     $ 22.0 $ 22.0