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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
United States    
Components of net periodic benefit cost:    
Interest cost on projected benefit obligation $ 1.6 $ 2.2
Expected return on plan assets (1.8) (2.3)
Amortization of net loss 1.2 1.0
Net periodic benefit cost 1.0 0.9
Change in benefit obligation:    
Employer contributions 2.4  
Expected remaining scheduled annual employer contributions for the current fiscal year 7.1  
Foreign Pension Plan, Defined Benefit    
Components of net periodic benefit cost:    
Service costs 0.2 0.1
Interest cost on projected benefit obligation 5.6 7.4
Expected return on plan assets (9.4) (9.5)
Amortization of net loss 2.1 1.0
Settlement loss recognized   0.1
Net periodic benefit cost (1.5) $ (0.9)
Change in benefit obligation:    
Employer contributions 6.9  
Expected remaining scheduled annual employer contributions for the current fiscal year $ 20.8