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Derivatives (Tables)
 6 Months Ended
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The fair values of derivatives existing as of June 30, 2013, and December 31, 2012, were included in the following captions in the Condensed Consolidated Balance Sheets (in millions):
 
Derivative Assets
 
Derivative Liabilities
 
June 30, 2013
 
December 31, 2012
 
June 30, 2013
 
December 31, 2012
 
Balance sheet
 location
 
Fair
Value
 
Balance
 sheet location
 
Fair
Value
 
Balance sheet
location
 
Fair
Value
 
Balance sheet
location
 
Fair
Value
Derivatives designated as hedging instruments
 
 
 
 
 
 
 
 
 
 
Commodity contracts
Other current assets
 
$
2.7

 
Other current assets
 
$
0.1

 
Other current liabilities
 
$
0.9

 
Other current liabilities
 
$
0.1

 
Other non-current assets
 
$
0.5

 
Other non-current assets
 
$
—

 
Other non-current liabilities
 
$
—

 
Other non-current liabilities
 
$
—
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Derivative Assets
 
Derivative Liabilities
 
June 30, 2013
 
December 31, 2012
 
June 30, 2013
 
December 31, 2012
 
Balance sheet
 location
 
Fair
Value
 
Balance
 sheet location
 
Fair
Value
 
Balance sheet
location
 
Fair
Value
 
Balance sheet
location
 
Fair
Value
Derivatives designated as hedging instruments
 
 
 
 
 
 
 
 
 
 
Commodity contracts
Other current assets
 
$
2.7

 
Other current assets
 
$
0.1

 
Other current liabilities
 
$
0.9

 
Other current liabilities
 
$
0.1

 
Other non-current assets
 
$
0.5

 
Other non-current assets
 
$
—

 
Other non-current liabilities
 
$
—

 
Other non-current liabilities
 
$
—


    
The Partnership estimates that approximately $0.4 million of net losses from cash flow hedges reported in Accumulated other comprehensive income/(loss) (AOCI) as of June 30, 2013, are expected to be reclassified into earnings within the next twelve months. The amount of gains and losses from cash flow hedges recognized in the Condensed Consolidated Statements of Income for the three months ended June 30, 2013, were (in millions):
 
Amount of
gain/(loss) recognized in AOCI on derivatives (effective portion)
 
Location of gain/(loss) reclassified from AOCI into income (effective portion)
 
Amount of
gain/(loss) reclassified from AOCI into income (effective portion)
 
Location of gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
 
Amount of
gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
Derivatives in Cash Flow Hedging Relationship
 
 
 
 
 
 
Commodity contracts
$
7.0

 
Operating
revenues (2)
 
$
(0.4
)
 
N/A
 
$
—

Interest rate contracts (1)
—

 
Interest expense
 
(0.6
)
 
N/A
 
—

 
$
7.0

 
 
 
$
(1.0
)
 
 
 
$
—


(1)
Related to amounts deferred in AOCI from Treasury rate locks used to hedge interest payments associated with debt offerings that were settled in previous periods and are being amortized to earnings over the terms of the related interest payments, generally the terms of the related debt.

(2)
Losses of $0.1 million were recorded in Transportation revenues and losses of $0.3 million were recorded in Other revenues.

The amount of gains and losses from cash flow hedges recognized in the Condensed Consolidated Statements of Income for the three months ended June 30, 2012, were (in millions):
 
Amount of
gain/(loss) recognized in AOCI on derivatives (effective portion)
 
Location of gain/(loss) reclassified from AOCI into income (effective portion)
 
Amount of
gain/(loss) reclassified from AOCI into income (effective portion)
 
Location of gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
 
Amount of
gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
Derivatives in Cash Flow Hedging Relationship
 
 
 
 
 
 
Commodity contracts
$
(0.4
)
 
Operating
  revenues (2)
 
$
0.3

 
N/A
 
$
—

Interest rate contracts (1)
(6.8
)
 
Interest expense
 
(0.4
)
 
N/A
 
—

 
$
(7.2
)
 
 
 
$
(0.1
)
 
 
 
$
—


(1)
Related to amounts deferred in AOCI from Treasury rate locks used to hedge interest payments associated with debt offerings that were settled in previous periods and are being amortized to earnings over the terms of the related interest payments, generally the terms of the related debt.

(2)
Gains of $0.1 million were recorded in Transportation revenues and gains of $0.2 million were recorded in Other revenues.

The amount of gains and losses from cash flow hedges recognized in the Condensed Consolidated Statements of Income for the six months ended June 30, 2013, were (in millions):
 
Amount of
gain/(loss) recognized in AOCI on derivatives (effective portion)
 
Location of gain/(loss) reclassified from AOCI into income (effective portion)
 
Amount of
gain/(loss) reclassified from AOCI into income (effective portion)
 
Location of gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
 
Amount of
gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
Derivatives in Cash Flow Hedging Relationship
 
 
 
 
 
 
Commodity contracts
$
2.5

 
Operating
revenues (2)
 
$
0.1

 
N/A
 
$
—

Interest rate contracts (1)
—

 
Interest expense
 
(1.2
)
 
N/A
 
—

 
$
2.5

 
 
 
$
(1.1
)
 
 
 
$
—


(1)
Related to amounts deferred in AOCI from Treasury rate locks used to hedge interest payments associated with debt offerings that were settled in previous periods and are being amortized to earnings over the terms of the related interest payments, generally the terms of the related debt.

(2)
Losses of $0.1 million were recorded in Transportation revenues and gains of $0.2 million were recorded in Other revenues.

The amount of gains and losses from cash flow hedges recognized in the Condensed Consolidated Statements of Income for the six months ended June 30, 2012, were (in millions):
 
Amount of
gain/(loss) recognized in AOCI on derivatives (effective portion)
 
Location of gain/(loss) reclassified from AOCI into income (effective portion)
 
Amount of
gain/(loss) reclassified from AOCI into income (effective portion)
 
Location of gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
 
Amount of
gain/(loss) recognized in income on derivative (in- effective portion and amount excluded from effectiveness testing)
Derivatives in Cash Flow Hedging Relationship
 
 
 
 
 
 
Commodity contracts
$
0.2

 
Operating
revenues (2)
 
$
0.4

 
N/A
 
$
—

Interest rate contracts (1)
(6.8
)
 
Interest expense
 
(0.9
)
 
N/A
 
—

 
$
(6.6
)
 
 
 
$
(0.5
)
 
 
 
$
—


(1)
Related to amounts deferred in AOCI from Treasury rate locks used to hedge interest payments associated with debt offerings that were settled in previous periods and are being amortized to earnings over the terms of the related interest payments, generally the terms of the related debt.

(2)
Gains of $0.2 million were recorded in Transportation revenues and gains of $0.2 million were recorded in Other revenues.