Income Taxes - Additional Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax (benefit) expense allocated to discontinued operations	$ 9.5	$ (7.3)	$ 10.4
Undistributed losses of foreign subsidiaries	15.9
Undistributed earnings of foreign subsidiaries, estimated taxes recognized upon distribution	$ 0.9
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward				$ 4.6
Foreign Tax Authority [Member] | Canada [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward				20.7
Foreign Tax Authority [Member] | Mexico [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforward				$ 28.9