Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Income from Continuing Operations	$ 55.7	$ 19.6	$ 18.6
Undistributed Earnings Allocated to Participating Securities - Continuing Operations	(1.3)	(0.5)	(0.7)
Income from continuing operations allocated to common shareholders	54.4	19.1	17.9
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.0	(0.3)	0.7
Undistributed Earnings Allocated to Participating Securities - Discontinued Operations	0.0	0.0	(0.1)
Income from discontinued operations allocated to common shareholders	0.0	(0.3)	0.6
Diluted net income	55.7	19.3	19.3
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	(1.3)	(0.5)	(0.8)
Diluted net income allocated to common shareholders	$ 54.4	$ 18.8	$ 18.5
Weighted Average Number of Shares Outstanding, Basic	18,525,374	18,528,302	18,443,233
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Share-based Awards For Diluted Earnings Per Share Calculation	406,861	604,000	625,264
Diluted weighted-average shares	18,932,235	19,132,302	19,068,497