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Asset Retirement Obligation (Table)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The schedule below summarizes the changes in the Partnership’s asset retirement obligations:
 
December 31, 2014
 
December 31, 2013
 
(in millions)
Beginning asset retirement obligations
$
7.7

 
$
9.1

Revisions to existing liabilities
2.2

 
(1.8
)
Liabilities acquired
8.7

 
—

Accretion
0.5

 
0.5

Liabilities settled
—

 
(0.1
)
Ending asset retirement obligations
$
19.1

 
$
7.7