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Asset Retirement Obligation (Table)
 6 Months Ended
Jun. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The schedule below summarizes the changes in the Partnership’s asset retirement obligation:
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
(in millions)
Beginning asset retirement obligations
$
14.0

 
$
20.6

Revisions to existing liabilities
(0.4
)
 
(4.0
)
Accretion
0.2

 
0.3

    Liabilities settled
(0.6
)
 
(3.2
)
Ending asset retirement obligations
$
13.2

 
$
13.7