Segment and Geographical Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciles consolidated EBITDA to consolidated net income
Net income	$ 14.3	$ 31.3
Interest income	(0.1)	(0.2)
Interest expense	4.5	2.9
Income tax expense (benefit)	5.9	(1.3)
Depreciation and amortization	15.0	12.2
EBITDA	$ 39.6	$ 44.9