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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2019
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligation Disclosure [Text Block]
 
Asset Retirement Obligations
 
March 31,
 
December 31,
 
2019
 
2018
Balance Sheet line item
(in millions)
Current:
 
 
 
Asset retirement obligations, current liability
$
5.9

 
$
5.1

Long-term:
 
 
 
Asset retirement obligations
96.2

 
96.9

Other long-term liabilities held for sale
—

 
57.6

Total ARO Liability
$
102.1

 
$
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
1.1

Additions
0.1

Revisions
(0.3
)
Liabilities related to assets sold(1)
(58.1
)
Liabilities settled
(0.3
)
ARO liability at March 31, 2019
$
102.1


_______________________
(1) 
Liabilities related to assets sold during the three months ended March 31, 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 three months ended March 31, 2019, includes $57.6 million related to the Haynesville Divestiture (refer to Note 3 – Acquisitions and Divestitures for more information).