Consolidated Statement Of Stockholders' Equity - 9 months ended Jun. 30, 2016 - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Noncontrolling Interest [Member]
Balance at Sep. 30, 2015	$ 367.8	$ 1.6	$ 1,574.8	$ (1,142.8)	$ (67.3)	$ 1.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(11.3)	0.0	(11.3)	0.0	0.0	0.0
Stock-based compensation	4.0	0.0	4.0	0.0	0.0	0.0
Shares retained for employee taxes	(3.2)	0.0		0.0	0.0	0.0
Stock issued under stock compensation plans	2.9	0.0	2.9	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax	(2.9)	0.0	0.0	0.0	(2.9)	0.0
Net Income (Loss) Attributable to Parent	37.4	0.0	0.0		0.0
Net Income (Loss) Attributable to Noncontrolling Interest						(0.3)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	37.1
Balance at Jun. 30, 2016	$ 394.4	$ 1.6	$ 1,567.2	$ (1,105.4)	$ (70.2)	$ 1.2