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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
United States      
Components of net periodic benefit cost:      
Service costs    
Interest cost on projected benefit obligation $ 1.0 1.6  
Expected return on plan assets (1.6) (1.8)  
Amortization of net loss 1.5 1.2  
Net periodic benefit cost 0.9 1.0  
Change in benefit obligation:      
Employer contributions 3.0    
Expected remaining scheduled annual employer contributions for the current fiscal year     $ 9.2
International      
Components of net periodic benefit cost:      
Service costs 0.1 0.2  
Interest cost on projected benefit obligation 5.3 5.6  
Expected return on plan assets (10.5) (9.4)  
Amortization of net loss 2.2 2.1  
Net periodic benefit cost (2.9) $ (1.5)  
Change in benefit obligation:      
Employer contributions $ 7.3    
Expected remaining scheduled annual employer contributions for the current fiscal year     $ 21.7