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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
United States Pension Plan of US Entity, Defined Benefit        
Components of net periodic (benefit) cost:        
Service costs $ 1.2 $ 1.1 $ 2.4 $ 2.2
Interest cost on projected benefit obligation 5.2 4.8 10.4 9.6
Expected return on plan assets (7.8) (7.7) (15.7) (15.5)
Amortization of net loss 1.0 1.1 2.0 2.2
Net periodic (benefit) cost (0.4) (0.7) (0.9) (1.5)
Change in benefit obligation:        
Employer contributions     4.3  
Expected remaining scheduled annual employer contributions for the current fiscal year     7.5  
Foreign Pension Plan, Defined Benefit        
Components of net periodic (benefit) cost:        
Service costs 0.3 0.3 0.6 0.6
Interest cost on projected benefit obligation 8.3 6.9 16.2 13.9
Expected return on plan assets (11.1) (10.1) (21.8) (20.3)
Amortization of prior service cost (0.1)   (0.1) (0.1)
Amortization of net loss 2.2 3.2 4.2 6.4
Settlement loss recognized 0.1   0.2  
Net periodic (benefit) cost $ (0.3) $ 0.3 (0.7) $ 0.5
Change in benefit obligation:        
Employer contributions     14.2  
Expected remaining scheduled annual employer contributions for the current fiscal year     $ 13.1