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Pension Benefit Obligations - Periodic Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
United States      
Pension Benefit Obligations      
Interest cost on projected benefit obligation $ 9.7 $ 9.8 $ 4.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Expected return on plan assets $ (5.5) $ (5.8) $ (5.6)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Amortization of net loss (gain) $ 3.1 $ 3.5 $ 5.6
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Settlement loss (gain) recognized   $ (0.1) $ 0.2
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Net periodic benefit cost (credit) $ 7.3 $ 7.4 $ 4.9
International      
Pension Benefit Obligations      
Service costs 0.2 0.3 0.5
Interest cost on projected benefit obligation $ 43.7 $ 47.7 $ 24.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Expected return on plan assets $ (57.4) $ (60.8) $ (41.4)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating 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 Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Amortization of net loss (gain) $ (2.3) $ (0.6) $ 6.9
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Settlement loss (gain) recognized $ 0.1 $ 0.2 $ 0.3
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income Other Nonoperating Income
Net periodic benefit cost (credit) $ (15.6) $ (13.1) $ (9.5)
Pension Plan, Defined Benefit      
Pension Benefit Obligations      
Applicable deferred income taxes, included in OCI arising from net prior service cost and net gain/loss $ 2.1 $ 3.1 $ 18.8