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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations [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,
 
2019
 
2018
Balance Sheet line item
(in millions)
Current:
 
 
 
Asset retirement obligations, current liability
$
6.0

 
$
5.1

Long-term:
 
 
 
Asset retirement obligations
94.9

 
96.9

Other long-term liabilities held for sale
—

 
57.6

Total ARO Liability
$
100.9

 
$
159.6
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
 
2019
 
2018
 
(in millions)
ARO liability at January 1,
$
159.6

 
$
214.1

Accretion
5.2

 
6.4

Additions
1.1

 
4.1

Revisions
(2.2
)
 
(4.9
)
Liabilities related to assets sold(1)
(60.7
)
 
(56.8
)
Liabilities settled
(2.1
)
 
(3.3
)
ARO liability at December 31,
$
100.9

 
$
159.6


___________________________
(1) 
Liabilities related to assets sold for the year ended December 31, 2019, includes $57.6 million related to the Haynesville Divestiture. Liabilities related to assets sold for the year ended December 31, 2018, includes $51.0 million related to the Uinta Basin Divestiture. Refer to Note 3 – Acquisitions and Divestitures for more information.