Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Consolidated Statement of Other Comprehensive Income (Loss) [Abstract]
Net income	$ 3.5	$ 3.3	$ 13.5	$ 18.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(0.1)	(0.5)	(4.0)	(1.1)
Pension liabilities adjustment	0	0	0.2	0.4
Net unrealized gain or loss on available-for-sale securities	(0.1)	0.5	(0.1)	0.7
Reclassification of adjustment for gains included in net income [Abstract]
Foreign currency transaction adjustment (included in other income)	0	0	0	(0.1)
Realized gain on available-for-sale securities (included in trading gains, net)	0	0	0	(8.3)
Income tax expense from reclassification adjustments (included in income tax expense)	0	0	0	2.0
Reclassification adjustment for gains included in net income	0	0	0	(6.4)
Other comprehensive loss	(0.2)	0	(3.9)	(6.4)
Comprehensive income	$ 3.3	$ 3.3	$ 9.6	$ 11.7