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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Percentage of Plan Assets:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense)    
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense)    
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Nonoperating Income (Expense)    
United States      
Percentage of Plan Assets:      
Interest cost on projected benefit obligation $ 2.5 $ 1.2  
Expected return on plan assets (1.5) (1.4)  
Amortization of net loss/(gain) 0.9 1.4  
Net periodic benefit cost (credit) 1.9 1.2  
Change in benefit obligation:      
Employer contributions 2.5    
Expected remaining scheduled annual employer contributions for the current fiscal year     $ 6.2
International.      
Percentage of Plan Assets:      
Service costs 0.1 0.1  
Interest cost on projected benefit obligation 11.5 6.4  
Expected return on plan assets (14.7) (11.0)  
Amortization of net loss/(gain) (0.1) 1.9  
Net periodic benefit cost (credit) (3.2) $ (2.6)  
Change in benefit obligation:      
Employer contributions $ 4.8    
Expected remaining scheduled annual employer contributions for the current fiscal year     $ 18.0