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Related Party Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Consolidated Related Party Debt Obligations
Consolidated related party debt obligations comprise the following as of the dates indicated:

 
December 31,
 
2016
 
2015
Five-Year Revolver, variable rate, due October 31, 2019 (1)
$
686.9

 
$
320.8

364-Day Revolver, variable rate, due March 1, 2017 (2)
—

 
137.4

Zydeco Revolver, variable rate, due August 6, 2019 (3)
—

 
—

Unamortized debt issuance costs
(0.9
)
 
(0.6
)
Debt payable - related party
$
686.0

 
$
457.6



(1) As of December 31, 2016, availability under the $760.0 million Five-Year Revolver was $73.1 million. We pay interest of 0.19% on the unused capacity of the Five-Year Revolver.
(2) As of December 31, 2016, availability under the $180.0 million 364-Day Revolver was $180.0 million. We pay interest of 0.12% on the unused capacity of the 364-Day Revolver.
(3) As of December 31, 2016, availability under the $30.0 million Zydeco Revolver was $30.0 million. We pay interest of 0.23% on the unused capacity of the Zydeco Revolver.