Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation cost	$ 1.2	$ 1.2	$ 3.4	$ 3.7
Total income tax benefit recognized	0.5	0.5	1.3	1.4
Total unrecognized compensation cost related to share-based compensation arrangements	6.9		6.9
Remaining weighted-average period for recognition of total unrecognized compensation cost, years			1.6
Non-vested shares outstanding	486,283		486,283
Stock Option Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	0	0.1	0	0.3
Performance-Accelerated Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	1.0	1.0	3.0	3.0
Non-Employee Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 0.2	$ 0.2	$ 0.4	$ 0.4