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Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Carrying value of long-term debt	$ 645.6	$ 645.3
Level 2 [Member]
Estimated fair value of long-term debt	$ 666.3	$ 687.7

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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