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Derivatives (Derivatives Other Than Cash Flow Hedges Table) (Details)
$ in Millions
Jun. 30, 2015
USD ($)
Derivative [Line Items]  
Derivative instruments at fair value $ 14.6
Market Approach Valuation Technique | Less than one year  
Derivative [Line Items]  
Derivative instruments at fair value 10.5
Market Approach Valuation Technique | One to two years  
Derivative [Line Items]  
Derivative instruments at fair value 4.1
Market Approach Valuation Technique | More than two years  
Derivative [Line Items]  
Derivative instruments at fair value $ 0.0