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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Percentage of Plan Assets:        
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 Other Nonoperating Income
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 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 Other Nonoperating Income
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 Other Nonoperating Income
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 Other Nonoperating Income
United States        
Percentage of Plan Assets:        
Interest cost on projected benefit obligation $ 2.4 $ 2.4 $ 7.3 $ 7.3
Expected return on plan assets (1.3) (1.4) (4.1) (4.3)
Amortization of net loss (gain) 0.8 0.9 2.3 2.6
Net periodic benefit cost (credit) 1.9 1.9 5.5 5.6
Change in benefit obligation:        
Employer contributions     8.6  
Expected remaining scheduled annual employer contributions for the current fiscal year 4.4   4.4  
International        
Percentage of Plan Assets:        
Service costs 0.1   0.2 0.2
Interest cost on projected benefit obligation 10.8 12.1 32.4 35.5
Expected return on plan assets (14.3) (15.5) (42.6) (45.3)
Amortization of prior service cost 0.1 0.1 0.1 0.1
Amortization of net loss (gain) (0.6) (0.1) (1.8) (0.4)
Settlement loss recognized   0.3   0.3
Net periodic benefit cost (credit) (3.9) $ (3.1) (11.7) $ (9.6)
Change in benefit obligation:        
Employer contributions     19.0  
Expected remaining scheduled annual employer contributions for the current fiscal year $ 8.5   $ 8.5