Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax benefit, including discontinued operations	$ (5.7)	$ (5.2)	$ 1.3	$ (1.8)
Tax credit			1.3		$ 1.6
Valuation allowance	$ 66.3		$ 66.3