Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 6.3	$ 8.8
Less: Net income allocated to participating securities	(0.1)	(0.1)
Net income allocated to common shareholders	$ 6.2	$ 8.7
Weighted average number of common shares outstanding	18,248,244	18,648,150
Dilutive potential common shares outstanding:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	236,751	343,753
Diluted weighted-average shares	18,484,995	18,991,903