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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
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]     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    
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other Nonoperating Income    
UNITED STATES          
Percentage of Plan Assets:          
Interest cost on projected benefit obligation $ 2.4 $ 1.2 $ 7.3 $ 3.5  
Expected return on plan assets (1.4) (1.4) (4.3) (4.2)  
Amortization of net loss (gain) 0.9 1.4 2.6 4.2  
Settlement loss recognized       0.2  
Net periodic benefit cost (credit) 1.9 1.2 5.6 3.7  
Change in benefit obligation:          
Employer contributions     5.9    
Expected remaining scheduled annual employer contributions for the current fiscal year         $ 3.3
International          
Percentage of Plan Assets:          
Service costs   0.2 0.2 0.4  
Interest cost on projected benefit obligation 12.1 6.0 35.5 18.7  
Expected return on plan assets (15.5) (10.4) (45.3) (32.2)  
Amortization of prior service cost 0.1 0.1 0.1 0.1  
Amortization of net loss (gain) (0.1) 1.7 (0.4) 5.4  
Settlement loss recognized 0.3 0.1 0.3 0.1  
Net periodic benefit cost (credit) $ (3.1) $ (2.3) (9.6) $ (7.5)  
Change in benefit obligation:          
Employer contributions     $ 18.8    
Expected remaining scheduled annual employer contributions for the current fiscal year         $ 5.2