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Risk Management Activities (The Effect Of Derivative Instruments Reclassified To Statements Of Consolidated Income) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Cash Flow Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in OCI Derivative (Effective Portion) | $ (0.1) | $ 0.7 | $ 0 | $ 1.4 |
| Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | (0.4) | (0.9) | (0.7) | (2.1) |
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Fair Value Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Derivatives | 0.2 | 0.8 | (9.5) | (8.2) |
| Amount of Gain Recognized in Income on Related Hedged Items | (0.2) | (0.8) | 9.5 | 8.2 |
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Not Designated as Hedging Instrument [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Derivatives | 7.7 | 17.2 | 1.3 | (5.2) |
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Interest Expense [Member] | Cash Flow Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | (0.4) | (0.7) | (0.8) | (1.3) |
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Cost Of Sales [Member] | Cash Flow Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 0 | (0.2) | 0.1 | (0.8) |
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Commodity Price Risk Programs [Member] | Cash Flow Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in OCI Derivative (Effective Portion) | (0.1) | 0.3 | 0 | 0.6 |
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Commodity Price Risk Programs [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Losses recognized in income, deferred | (7.6) | (4.7) | (1.0) | (15.1) |
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Commodity Price Risk Programs [Member] | Gas Distribution Revenues [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Derivatives | (0.1) | (0.1) | 0 | 0.3 |
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Commodity Price Risk Programs [Member] | Other Revenues [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Derivatives | 10.8 | 7.7 | 22.8 | 6.0 |
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Commodity Price Risk Programs [Member] | Cost Of Sales [Member] | Not Designated as Hedging Instrument [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Derivatives | (3.0) | 9.6 | (21.5) | (11.5) |
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Interest Rate Risk Activities [Member] | Cash Flow Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in OCI Derivative (Effective Portion) | 0 | 0.4 | 0 | 0.8 |
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Interest Rate Risk Activities [Member] | Interest Expense [Member] | Fair Value Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Derivatives | 0.2 | 0.8 | (9.5) | (8.2) |
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Fixed Rate Debt Hedges [Member] | Interest Expense [Member] | Fair Value Hedging [Member]
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| Derivative Instruments Gain Loss [Line Items] | ||||
| Amount of Gain Recognized in Income on Related Hedged Items | $ (0.2) | $ (0.8) | $ 9.5 | $ 8.2 |