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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 |  |
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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) |  |  |  |  |  |  |  |

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