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Share-Based Payments (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Share-based Compensation [Abstract]        
Compensation expense recognized in continuing operations $ 4.3 $ 4.0 $ 8.6 $ 8.1
Excess tax benefits from share-based payments $ 0.4 $ 3.0 $ 5.8 $ 4.1
Shares issued upon exercise of stock options (in shares) 22,638 235,703 308,019 293,082