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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Income Tax Disclosure [Abstract]    
Effective income tax rate 12.00% 13.00%
Reserves for uncertain tax positions   $ 8.3
Estimated accrued interest and penalties $ 2.7 $ 2.7