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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)