Property, Plant and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Sep. 30, 2016
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 1,873.4	$ 1,767.8
Accumulated depreciation	(1,073.0)	(961.5)
Total property, plant and equipment, net	800.4	806.3
Land and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	11.6	11.6
Building and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	137.1	133.5
Furniture and fixtures [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	30.4	29.5
Machinery and equipment [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	1,579.7	1,533.3
Construction in progress [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 114.6	$ 59.9