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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligation Disclosure [Text Block]
 
Asset Retirement Obligations
 
June 30,
 
December 31,
 
2019
 
2018
Balance Sheet line item
(in millions)
Current:
 
 
 
Asset retirement obligations, current liability
$
6.8

 
$
5.1

Long-term:
 
 
 
Asset retirement obligations
94.6

 
96.9

Other long-term liabilities held for sale
—

 
57.6

Total ARO Liability
$
101.4

 
$
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 period specified below:
 
Asset Retirement Obligations
 
(in millions)
ARO liability at January 1, 2019
$
159.6

Accretion
3.1

Additions
0.4

Revisions
(0.3
)
Liabilities related to assets sold(1)
(60.7
)
Liabilities settled
(0.7
)
ARO liability at June 30, 2019
$
101.4


_______________________
(1) 
Liabilities related to assets sold during the six months ended June 30, 2019, includes $57.6 million related to the Haynesville Divestiture (refer to Note 3 – Acquisitions and Divestitures for more information).
 [1]
[1]
(1) 
Liabilities related to assets sold during the six months ended June 30, 2019, includes $57.6 million related to the Haynesville Divestiture (refer to Note 3 – Acquisitions and Divestitures for more information).