Income Taxes - US and International Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ (13.9)	$ 4.9	$ 14.5
Income (Loss) from Continuing Operations before Income Taxes, Foreign	29.1	67.9	63.7
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 15.2	$ 72.8	$ 78.2