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Cost Reduction Actions (Carrying Amount of Accrual) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Restructuring and Related Activities [Abstract]              
Cost reduction actions $ 0.0 $ 25.5 $ 0.0 $ 0.0 $ 0.0 $ 25.5 $ 0.0
Cash expenditures         (13.5) (6.9)  
Amount reflected in pension liability           (0.3)  
Currency translation adjustment         0.4 (0.5)  
Accrued balance $ 17.8       $ 4.7 $ 17.8