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Pension Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
United States        
Components of net periodic benefit cost:        
Service costs   $ 1.2   $ 2.4
Interest cost on projected benefit obligation $ 6.0 5.2 $ 11.9 10.4
Expected return on plan assets (6.9) (7.8) (13.7) (15.7)
Amortization of net loss 0.9 1.0 1.8 2.0
Settlement loss recognized 0.1   0.1  
Net periodic benefit cost 0.1 (0.4) 0.1 (0.9)
Change in benefit obligation:        
Employer contributions     4.9  
Expected remaining scheduled annual employer contributions for the current fiscal year 9.4   9.4  
Foreign Pension Plan, Defined Benefit        
Components of net periodic benefit cost:        
Service costs 0.1 0.3 0.2 0.6
Interest cost on projected benefit obligation 7.7 8.3 15.1 16.2
Expected return on plan assets (9.8) (11.1) (19.3) (21.8)
Amortization of prior service costs (0.1) (0.1) (0.1) (0.1)
Amortization of net loss 1.1 2.2 2.1 4.2
Settlement loss recognized   0.1 0.1 0.2
Net periodic benefit cost (1.0) $ (0.3) (1.9) $ (0.7)
Change in benefit obligation:        
Employer contributions     14.9  
Expected remaining scheduled annual employer contributions for the current fiscal year $ 12.4   $ 12.4