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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,480.3	$ 1,467.1
Less accumulated depreciation	(887.1)	(871.2)
Property, plant and equipment, net	593.2	595.9
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	72.0	71.4
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	410.9	407.3
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	740.9	729.5
Software and Related Costs
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	201.3	203.0
Equipment on Operating Lease to Others
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	9.9	18.8
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 45.3	$ 37.1

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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