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Fair Value Measurements, Derivatives and Other Comprehensive Income (OCI) Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table shows the components and reclassifications to net income of Accumulated other comprehensive loss which is included in Partners' Capital on the Condensed Consolidated Balance Sheets for the three months ended June 30, 2013 (in millions):
 
 Cash Flow Hedges
 
 Pension and Other Postretirement Costs
 
Total
Beginning balance, April 1, 2013
$
(19.9
)
 
$
(53.5
)
 
$
(73.4
)
Gain (loss) recorded in accumulated other comprehensive loss
7.0

 
—

 
7.0

Reclassifications:
 
 
 
 
 
Transportation operating revenues
0.1

 
—

 
0.1

Other operating revenues
0.3

 
—

 
0.3

Interest expense
0.6

 
—

 
0.6

Administrative and general expense
—

 
(1.9
)
 
(1.9
)
 
 
 
 
 
 
Ending balance, June 30, 2013
$
(11.9
)
 
$
(55.4
)
 
$
(67.3
)

The following table shows the components and reclassifications to net income of Accumulated other comprehensive loss which is included in Partners' Capital on the Condensed Consolidated Balance Sheets for the six months ended June 30, 2013 (in millions):
 
 Cash Flow Hedges
 
 Pension and Other Postretirement Costs
 
Total
Beginning balance, January 1, 2013
$
(15.5
)
 
$
(51.8
)
 
$
(67.3
)
Gain (loss) recorded in accumulated other comprehensive loss
2.5

 
—

 
2.5

Reclassifications:
 
 
 
 
 
Transportation operating revenues
0.1

 
—

 
0.1

Other operating revenues
(0.2
)
 
—

 
(0.2
)
Interest expense
1.2

 
—

 
1.2

Administrative and general expense
—

 
(3.6
)
 
(3.6
)
 
 
 
 
 
 
Ending balance, June 30, 2013
$
(11.9
)
 
$
(55.4
)
 
$
(67.3
)