Property, Plant and Equipment schedule of property, plant and equipment (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Land, buildings and improvements	$ 812.0	$ 778.1
Construction in Progress, Gross	43.8	40.4
Less: Accumulated depreciation	307.5	274.2
Property, plant and equipment, net (Note 11)	504.5	503.9
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Land, buildings and improvements	154.8	146.6
Machinery, equipment and other
Property, Plant and Equipment [Line Items]
Land, buildings and improvements	401.4	380.8
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Land, buildings and improvements	$ 212.0	$ 210.3