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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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
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
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
United States    
Percentage of Plan Assets:    
Interest cost on projected benefit obligation $ 2.4 $ 2.5
Expected return on plan assets (1.4) (1.5)
Amortization of net loss/(gain) 0.8 0.9
Net periodic benefit cost (credit) 1.8 1.9
Change in benefit obligation:    
Employer contributions 2.3  
Expected remaining scheduled annual employer contributions for the current fiscal year 10.6  
International    
Percentage of Plan Assets:    
Service costs 0.1 0.1
Interest cost on projected benefit obligation 10.7 11.5
Expected return on plan assets (14.1) (14.7)
Amortization of net loss/(gain) (0.6) (0.1)
Net periodic benefit cost (credit) (3.9) $ (3.2)
Change in benefit obligation:    
Employer contributions 6.2  
Expected remaining scheduled annual employer contributions for the current fiscal year $ 16.0