Earnings per Share - EPS Reconciliation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations	$ 3.7	$ 5.1	$ 13.8	$ 16.9
Less: Allocation to participating securities	(0.1)	(0.2)	(0.4)	(0.7)
Income from continuing operations allocated to common stockholders	3.6	4.9	13.4	16.2
(Loss) income from discontinued operations, net of tax	(0.2)	(1.8)	(0.3)	1.2
Less: Allocation to participating securities	0	0.1	0	0
(Loss) income from discontinued operations allocated to common stockholders	(0.2)	(1.7)	(0.3)	1.2
Diluted net income	3.5	3.3	13.5	18.1
Less: Allocation to participating securities	(0.1)	(0.1)	(0.4)	(0.7)
Diluted net income allocated to common stockholders	$ 3.4	$ 3.2	$ 13.1	$ 17.4
Weighted average number of common shares outstanding	18,443,256	18,480,644	18,560,080	18,377,965
Share-based awards	490,570	383,396	610,058	484,907
Diluted weighted-average shares	18,933,826	18,864,040	19,170,138	18,862,872