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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities $ 137.1 $ 128.7
Fair value assets measured on recurring basis, total 144.7 128.8
Fair value liabilities measured on recurring basis, total 271.1 31.9
Fair Value, Inputs, Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, total 1.9 0.1
Fair value liabilities measured on recurring basis, total 4.5 14.3
Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, total 142.8 128.7
Fair value liabilities measured on recurring basis, total 266.5 17.4
Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, total 0.0 0.0
Fair value liabilities measured on recurring basis, total 0.1 0.2
Available-for-sale Securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 137.1 128.7
Available-for-sale Securities | Fair Value, Inputs, Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 0.0 0.0
Available-for-sale Securities | Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 137.1 128.7
Available-for-sale Securities | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 0.0 0.0
Risk management assets    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, derivative financial instruments 7.6 0.1
Fair value liabilities measured on recurring basis, derivative financial instruments 271.1 [1] 31.9 [2]
Risk management assets | Fair Value, Inputs, Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, derivative financial instruments 1.9 0.1
Fair value liabilities measured on recurring basis, derivative financial instruments 4.5 [1] 14.3 [2]
Risk management assets | Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, derivative financial instruments 5.7 0.0
Fair value liabilities measured on recurring basis, derivative financial instruments 266.5 [1] 17.4 [2]
Risk management assets | Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Fair value assets measured on recurring basis, derivative financial instruments 0.0 0.0
Fair value liabilities measured on recurring basis, derivative financial instruments $ 0.1 [1] $ 0.2 [2]
[1] Includes $6.6 million of current risk management liabilities which are included in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).
[2] Includes $9.3 million of current risk management liabilities which are included in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).