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Income Taxes (Narrative) (Details)
€ in Millions, RM in Millions, R$ in Millions, $ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2024
USD ($)
Feb. 29, 2024
MYR (RM)
Jul. 31, 2023
BRL (R$)
Sep. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2025
AUD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
AUD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
AUD ($)
Aug. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]                                  
Income Tax Expense (Benefit) Excluding Discrete Items               $ 23.8         $ 77.2        
Income tax benefit       $ 28.6       24.3       $ 253.6 7.2        
Amount agreed with Australia tax authorities for tax assessment                               $ 4.0  
Deferred Foreign Income Tax Expense (Benefit)         $ 168.8                        
Loss Contingency, Damages Sought, Value | R$     R$ 601.0                            
Loss Contingency, Income Tax, Payment Plan Period                                 7 months
Effective Income Tax Rate, Continuing Operations, Excluding Discrete Items       14.10%               14.80%          
Income Tax Expense (Benefit), Discrete Item               $ 0.5         $ 70.0        
Amount agreed with Australia tax authorities for tax assessment                               $ 4.0  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities             $ 18.0                    
MALAYSIA                                  
Effective Income Tax Rate Reconciliation [Line Items]                                  
Loss Contingency, Damages Sought, Value $ 28.0 RM 117.0                              
Australian Taxation Office                                  
Effective Income Tax Rate Reconciliation [Line Items]                                  
Payments for Other Taxes                   $ 29.0 $ 42.0            
Amount agreed with Australia tax authorities for tax assessment             2.0                    
Proceeds from Income Tax Refund, Foreign         26.0 $ 42.0                      
Loss Contingency, Damages Sought, Value                           $ 101.0      
Payments for Other Taxes                   $ 29.0 $ 42.0            
Amount agreed with Australia tax authorities for tax assessment             2.0                    
Proceeds from Income Tax Refund, Foreign         $ 26.0 $ 42.0                      
Luxembourg subsidiaries                                  
Effective Income Tax Rate Reconciliation [Line Items]                                  
Liability for Uncertainty in Income Taxes, Noncurrent             $ 65.0               € 60.0    
Income tax benefit                 $ (65.0)