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Cost Reduction Actions (Carrying Amount of Accrual) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring and Related Activities [Abstract]        
Cost reduction actions $ 25.5 $ 0.0 $ 25.5 $ 0.0
Cash expenditures (4.7)      
Amount reflected in pension liability (0.3)      
Currency translation adjustment 0.1      
Accrued balance $ 20.6   $ 20.6