Cost Reduction Actions (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) position
Restructuring Cost and Reserve [Line Items]
Cost reduction actions | $	$ 0.0	$ 25.5	$ 0.0	$ 25.5	$ 25.5
Severance and other benefits | Cost reduction actions
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position					300