Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Property, plant and equipment
Property, plant and equipment, gross	$ 1,121.8		$ 1,121.8		$ 1,093.7
Less accumulated depreciation	(643.5)		(643.5)		(617.9)
Property, plant and equipment, net	478.3		478.3		475.8
Depreciation expenses	18.7	$ 16.2	35.8	$ 32.3
Land and land improvements
Property, plant and equipment
Property, plant and equipment, gross	57.6		57.6		57.5
Buildings
Property, plant and equipment
Property, plant and equipment, gross	279.1		279.1		274.8
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, gross	713.0		713.0		681.1
Equipment on operating lease to others
Property, plant and equipment
Property, plant and equipment, gross	41.6		41.6		42.2
Equipment on operating lease, net	33.8		$ 33.8		33.9
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
Construction in progress
Property, plant and equipment
Property, plant and equipment, gross	$ 30.5		$ 30.5		$ 38.1