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Acquisitions (Pro Forma Financial Information) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Business Combinations [Abstract]
Revenue	$ 1,227.8	$ 1,075.3
Net income	$ 93.0	$ 26.0
Earnings per share-Basic (in USD per share)	$ 0.79	$ 0.22
Earnings per share-Diluted (in USD per share)	$ 0.77	$ 0.22

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details