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
3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Shareholders' Equity    
Cash dividends paid on common stock $ 11.9 $ 11.7
Number of shares retired 0.2