Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Property, plant and equipment
Property, plant and equipment, gross	$ 1,194.4		$ 1,188.8
Less accumulated depreciation	(736.4)		(718.9)
Property, plant and equipment, net	458.0		469.9
Depreciation expenses	20.1	$ 18.9
Land and land improvements
Property, plant and equipment
Property, plant and equipment, gross	58.1		58.5
Buildings
Property, plant and equipment
Property, plant and equipment, gross	298.2		298.5
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, gross	657.6		652.2
Software and related costs
Property, plant and equipment
Property, plant and equipment, gross	151.7		149.6
Equipment on operating lease to others
Property, plant and equipment
Property, plant and equipment, gross	28.8		30.0
Equipment on operating lease, net	$ 19.8		$ 21.6
Equipment on operating lease to others | Minimum
Property, plant and equipment
Estimated useful life (in years)	5 years
Equipment on operating lease to others | Maximum
Property, plant and equipment
Estimated useful life (in years)	10 years