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Pension Benefit Obligations - Schedule of Components of Net Periodic Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service costs | $ 0.0 | $ 0.0 | $ 0.0
Interest cost on projected benefit obligation | $ 7.9 | $ 9.7 | $ 9.8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Expected return on plan assets | $ (4.8) | $ (5.5) | $ (5.8)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Amortization of prior service costs | $ 0.0 | $ 0.0 | $ 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Amortization of net loss (gain) | $ 3.7 | $ 3.1 | $ 3.5
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Settlement loss (gain) recognized | $ 0.1 | $ 0.0 | $ (0.1)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Net periodic benefit cost (credit) | $ 6.9 | $ 7.3 | $ 7.4
Int’l |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service costs | 0.2 | 0.2 | 0.3
Interest cost on projected benefit obligation | $ 40.1 | $ 43.7 | $ 47.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Expected return on plan assets | $ (52.2) | $ (57.4) | $ (60.8)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Amortization of prior service costs | $ 0.1 | $ 0.1 | $ 0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Amortization of net loss (gain) | $ (1.3) | $ (2.3) | $ (0.6)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Settlement loss (gain) recognized | $ 0.0 | $ 0.1 | $ 0.2
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income | Other income | Other income
Net periodic benefit cost (credit) | $ (13.1) | $ (15.6) | $ (13.1)

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