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Derivative Instruments, Hedging Activities and Fair Value (Details 6) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Long-term debt, including current maturities
Fair value of long-term debt	$ 898.2	$ 832.6
Carrying value of long-term debt	$ 855.8	$ 803.4

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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