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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation [Abstract]  
asset retirement obligation liability [Table Text Block]
The Consolidated Balance Sheet line items of QEP's ARO liability are presented in the table below:
 
Asset Retirement Obligations
 
December 31,
 
2018
 
2017
Balance Sheet line item
(in millions)
Current:
 
 
 
Asset retirement obligations, current liability
$
5.1

 
$
2.8

Long-term:
 
 
 
Asset retirement obligations
96.9

 
104.1

Other long-term liabilities held for sale
57.6

 
107.2

Total ARO Liability
$
159.6

 
$
214.1
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The following is a reconciliation of the changes in the Company's ARO for the periods specified below:
 
Asset Retirement Obligations
 
2018
 
2017
 
(in millions)
ARO liability at January 1,
$
214.1

 
$
231.6

Accretion
6.4

 
7.7

Additions(1)
4.1

 
23.5

Revisions
(4.9
)
 
8.5

Liabilities related to assets sold(2)
(56.8
)
 
(34.9
)
Liabilities settled
(3.3
)
 
(22.3
)
ARO liability at December 31,
$
159.6

 
$
214.1


___________________________
(1) 
Additions for the year ended December 31, 2017, include $14.2 million related to the 2017 Permian Basin Acquisition. Refer to Note 3 – Acquisitions and Divestitures for more information.
(2) 
Liabilities related to assets sold for the year ended December 31, 2018, includes $51.0 million related to the Uinta Basin Divestiture. Liabilities related to assets sold for the year ended December 31, 2017 includes $34.9 million related to the Pinedale Divestiture. Refer to Note 3 – Acquisitions and Divestitures for more information.