Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,397.0	$ 1,360.9
Less accumulated depreciation	(831.1)	(787.3)
Property, plant and equipment, net	565.9	573.6
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	63.9	55.8
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	377.1	325.8
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	723.7	701.0
Software and Related Costs
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	175.6	181.2
Equipment on Operating Lease to Others
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	21.7	39.5
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 35.0	$ 57.6