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Fair Values of Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total Carrying Value	$ 1,136.4us-gaap_LongTermDebt	$ 1,137.6us-gaap_LongTermDebt
Total borrowings	1,139.0us-gaap_DebtInstrumentCarryingAmount	1,140.4us-gaap_DebtInstrumentCarryingAmount
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Estimated Fair Value	$ 1,134.5	$ 1,102.0

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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