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Fair Value Measurements (Details Textual) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Measurements (Textual) [Abstract]
Estimated fair value of debt	$ 1,246.4	$ 1,240.4
Carrying value of debt	$ 1,218.9	$ 1,222.0

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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