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Note 3 - Fair Value Measurement Fair Value by Balance sheet grouping Table (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Long-term Debt $ 2,339.2us-gaap_LongTermDebt $ 2,166.8us-gaap_LongTermDebt
Long-term Debt, Fair Value $ 2,215.0us-gaap_LongTermDebtFairValue $ 2,099.8us-gaap_LongTermDebtFairValue