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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2021
United States          
Components of net periodic benefit cost:          
Interest cost on projected benefit obligation $ 1.1 $ 1.6 $ 3.2 $ 4.8  
Expected return on plan assets (1.6) (1.8) (4.8) (5.3)  
Amortization of prior service cost       0.1  
Amortization of net loss 1.4 1.3 4.4 3.7  
Curtailment loss recognized   0.5   0.5  
Settlement loss recognized 0.1   0.1 0.5  
Net periodic benefit cost 1.0 1.6 2.9 4.3  
Change in benefit obligation:          
Employer contributions     10.1    
Expected remaining scheduled annual employer contributions for the current fiscal year         $ 4.6
International          
Components of net periodic benefit cost:          
Service costs 0.1 0.1 0.4 0.4  
Interest cost on projected benefit obligation 5.5 5.4 16.2 16.7  
Expected return on plan assets (11.1) (9.1) (32.6) (27.9)  
Amortization of prior service cost 0.1   0.1    
Amortization of net loss 2.4 2.1 6.9 6.4  
Settlement loss recognized       0.2  
Net periodic benefit cost $ (3.0) $ (1.5) (9.0) $ (4.2)  
Change in benefit obligation:          
Employer contributions     $ 18.9    
Expected remaining scheduled annual employer contributions for the current fiscal year         $ 7.8