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Derivative Instruments, Hedging Activities and Fair Value (Details 6) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Long-term debt, including current maturities
Fair value of long-term debt	$ 927.5us-gaap_LongTermDebtFairValue	$ 885.0us-gaap_LongTermDebtFairValue
Carrying value of long-term debt	$ 900.2us-gaap_LongTermDebt	$ 854.9us-gaap_LongTermDebt

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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