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Fair Value Measurement (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Fair Value Disclosures [Abstract]
Long-term Debt	$ 3,510.8	$ 3,609.4
Estimated fair value long-term debt	$ 3,686.1	$ 3,761.8

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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