Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Income from continuing operations	$ 12.2	$ 3.7	$ 34.6	$ 13.8
Undistributed Earnings Allocated to Participating Securities - Continuing Operations	(0.3)	(0.1)	(0.8)	(0.4)
Income from continuing operations allocated to common shareholders	11.9	3.6	33.8	13.4
Loss from discontinued operations, net of tax	0.0	(0.2)	0.0	(0.3)
Undistributed Earnings Allocated to Participating Securities - Discontinued Operations	0.0	0.0	0.0	0.0
Income from discontinued operations allocated to common shareholders	0.0	(0.2)	0.0	(0.3)
Diluted net income	12.2	3.5	34.6	13.5
Less: Allocation to participating securities	(0.3)	(0.1)	(0.8)	(0.4)
Diluted net income allocated to common shareholders	$ 11.9	$ 3.4	$ 33.8	$ 13.1
Weighted average number of common shares outstanding	18,698,734	18,443,256	18,573,617	18,560,080
Dilutive potential common shares outstanding:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	386,013	490,570	379,554	610,058
Diluted weighted-average shares	19,084,747	18,933,826	18,953,171	19,170,138