CONSOLIDATED STATMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2010
Net income	$ 65.7	$ 53.5	[1]	$ 43.2	[1]
Change in unrealized fair value on cash flow hedges (Note 2)	0.1	0.1		0.1
Comprehensive income	$ 65.8	$ 53.6		$ 43.3

[1] Retrospectively adjusted as described in Note 1.