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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
United States Pension Plan of US Entity, Defined Benefit    
Components of net periodic (benefit) cost:    
Service costs $ 1.2 $ 1.1
Interest cost on projected benefit obligation 5.2 4.8
Expected return on plan assets (7.9) (7.8)
Amortization of net loss 1.0 1.1
Net periodic (benefit) cost (0.5) (0.8)
Change in benefit obligation:    
Employer contributions 2.5  
Expected remaining scheduled annual employer contributions for the current fiscal year 10.2  
Foreign Pension Plan, Defined Benefit    
Components of net periodic (benefit) cost:    
Service costs 0.3 0.3
Interest cost on projected benefit obligation 7.9 7.0
Expected return on plan assets (10.7) (10.2)
Amortization of prior service cost   (0.1)
Amortization of net loss 2.0 3.2
Settlement loss recognized 0.1  
Net periodic (benefit) cost (0.4) $ 0.2
Change in benefit obligation:    
Employer contributions 6.8  
Expected remaining scheduled annual employer contributions for the current fiscal year $ 19.9