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Fair Value Measurements (Carrying Amounts And Related Estimated Fair Value Of Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value Measurements [Abstract]
Long-term debt including current maturities, Carrying Amount	$ 749.2	$ 670.6
Long-term debt including current maturities, Fair Value	$ 606.8	$ 641.0

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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