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Fair Value Measurements and the Fair Value Option (Fair Value of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Fair Value Disclosures [Abstract]
Long-term Debt, Fair Value	$ 362.0
Long-term Debt, Carrying Value	$ 354.9

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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