Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Shareholders' Equity    
Cash dividends paid on common stock $ 23.8 $ 23.5
Number of shares retired 0.2