Cost Reduction and Asset Actions (Carrying Amount of Accrual) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Cost reduction and asset actions	$ 42.7	$ 13.2	$ 103.0	$ 23.9
Cost Reduction Actions [Member]
Restructuring Cost and Reserve [Line Items]
Cost reduction and asset actions	42.7		106.4		$ 34.5
Noncash expenses			(74.6)
Amount reflected in pension liability			(1.0)		(0.9)
Amount reflected in other noncurrent liabilities			(2.2)
Cash expenditures			(27.9)		(21.6)
Currency translation adjustment			(0.4)		0.3
Accrued balance	12.6		12.6		12.3
Cost Reduction Actions [Member] | Severance And Other Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Cost reduction and asset actions	9.5	$ 13.2	27.5	$ 23.9	34.5
Noncash expenses			0.0
Amount reflected in pension liability			(1.0)		(0.9)
Amount reflected in other noncurrent liabilities			0.0
Cash expenditures			(27.0)		(21.6)
Currency translation adjustment			(0.4)		0.3
Accrued balance	11.4		11.4		12.3
Cost Reduction Actions [Member] | Asset Actions [Member]
Restructuring Cost and Reserve [Line Items]
Cost reduction and asset actions	33.2		78.9		0.0
Noncash expenses			(74.6)
Amount reflected in pension liability			0.0		0.0
Amount reflected in other noncurrent liabilities			(2.2)
Cash expenditures			(0.9)		0.0
Currency translation adjustment			0.0		0.0
Accrued balance	$ 1.2		$ 1.2		$ 0.0