Consolidated Statements of Comprehensive Income Statement (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 19.3	$ 12.7	$ 34.7
Foreign currency translation adjustment	(1.8)	(1.1)	(0.4)
Net unrealized gain on derivative instruments	0	0	1.0
Pension liabilities adjustment	3.4	(1.6)	(2.9)
Net unrealized gain or loss on available-for-sale securities	0.6	6.5	(0.6)
Foreign currency translation adjustment (included in other income)	(0.1)	0	0
Realized gain on available-for-sale securities (included in trading gains, net)	(8.3)	0	0
Income tax expense from reclassification adjustments (included in income tax expense)	2.0	0	0
Reclassification adjustment for gains included in net income	(6.4)	0	0
Other comprehensive (loss) income	(4.2)	3.8	(2.9)
Comprehensive income	$ 15.1	$ 16.5	$ 31.8