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Fair Value Measurements (Narrative) (Details) (USD $) In Millions	Jun. 30, 2011	Sep. 30, 2010
Fair Value Measurements
Fixed rate debt, carrying amount	$ 1,951.6	$ 1,991.4
Fixed rate debt, estimated fair value	$ 2,140.2	$ 2,399.5

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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