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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
United States Pension Plan of US Entity, Defined Benefit    
Components of net periodic (benefit) cost:    
Service costs $ 1.1 $ 1.8
Interest cost on projected benefit obligation 4.8 5.7
Expected return on plan assets (7.8) (7.8)
Amortization of net loss 1.1 1.0
Curtailment gain recognized   (6.8)
Settlement (gain) loss recognized   (1.0)
Net periodic (benefit) cost (0.8) (7.1)
Change in benefit obligation:    
Employer contributions 2.6  
Expected remaining scheduled annual employer contributions for the current fiscal year 7.2  
Foreign Pension Plan, Defined Benefit    
Components of net periodic (benefit) cost:    
Service costs 0.3 0.3
Interest cost on projected benefit obligation 7.0 10.5
Expected return on plan assets (10.2) (12.8)
Amortization of prior service credits (0.1) (0.1)
Amortization of net loss 3.2 1.4
Settlement (gain) loss recognized   0.1
Net periodic (benefit) cost 0.2 $ (0.6)
Change in benefit obligation:    
Employer contributions 5.7  
Expected remaining scheduled annual employer contributions for the current fiscal year $ 18.3