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Cost Reduction and Asset 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, 2019
Sep. 30, 2018
Sep. 30, 2017
Restructuring and Related Activities [Abstract]              
Cost reduction and asset actions $ 0.0 $ 25.5 $ 0.0 $ 0.0 $ 25.5 $ 0.0 $ 151.4
Cash expenditures         (6.9)    
Amount reflected in pension liability         (0.3)    
Currency translation adjustment         (0.5)    
Accrued balance $ 17.8       $ 17.8