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Financing Arrangements (Fair Value of Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying amount	$ 443.8us-gaap_LongTermDebt	$ 383.6us-gaap_LongTermDebt
Level 1 \| Reported Value Measurement
Debt Instrument [Line Items]
Carrying amount	250.0	250.0
Level 1 \| Estimate of Fair Value Measurement
Debt Instrument [Line Items]
Fair value	$ 266.3	$ 275.6

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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