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Investments in Unconsolidated Affiliates Investments in Unconsolidated Affiliates (Tables)
 12 Months Ended
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]  
Equity Method Investments [Table Text Block]
 
Ownership Percentage
 
Investment
 
Earnings (Loss) from Unconsolidated Affiliates
 
December 31,
 
December 31,
 
Year Ended December 31,
 
2015
 
2015
 
2014
 
2015
 
2014
 
2013
Jackalope Gas Gathering Services, L.L.C.(1)
50.00
%
(4) 
$
202.4

 
$
232.9

 
$
(43.4
)
(5) 
$
0.5

 
$
0.1

Tres Palacios Holdings LLC(2)
50.01
%
 
36.8

 
36.0

 
2.5

 
0.2

 
—

Powder River Basin Industrial Complex, LLC(3)
50.01
%
 
15.1

 
26.2

 
(19.9
)
(5) 
(1.4
)
 
(0.2
)
Total
 
 
$
254.3

 
$
295.1

 
$
(60.8
)
 
$
(0.7
)
 
$
(0.1
)