Restructuring And Related Charges (Rollforward Of Restructuring Accrual) (Details) $ in Millions	6 Months Ended
	Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Accrual balance at beginning	$ 7.8
Provisions	11.9
Cash expenditures	(3.0)
Non-cash items	(0.8)
Accrual balance at ending	15.9
Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Accrual balance at beginning	3.1
Provisions	2.2
Cash expenditures	(1.4)
Non-cash items	(0.7)
Accrual balance at ending	3.2
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Accrual balance at beginning	4.7
Provisions	9.7
Cash expenditures	(1.6)
Non-cash items	(0.1)
Accrual balance at ending	$ 12.7