Cost Reduction Actions (Carrying Amount of Accrual) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Cost reduction actions	$ 0.0	$ 25.5	$ 0.0	$ 25.5	$ 25.5
Cash expenditures			(11.2)		(6.9)
Amount reflected in pension liability					(0.3)
Currency translation adjustment			0.2		(0.5)
Accrued balance	$ 6.8		$ 6.8		$ 17.8