Property, Plant and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 1,983.6	$ 1,767.8
Accumulated depreciation	(1,125.9)	(961.5)
Total property, plant and equipment, net	857.7	806.3
Land and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	11.7	11.6
Building and improvements [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	137.5	133.5
Furniture and fixtures [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	30.7	29.5
Machinery and equipment [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	1,604.3	1,533.3
Construction in progress [Member]
Property, Plant and Equipment
Total property, plant and equipment, gross	$ 199.4	$ 59.9