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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
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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).

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