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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations
The following table presents the changes in the net asset retirement obligations for the years ended December 31, 2019 and 2018 (in millions):
 
2019
 
2018
Net asset retirement obligations at January 1
$
28.1

 
$
28.1

Liabilities acquired (1)
1.7

 
—

Liabilities incurred
3.4

 
1.2

Liabilities settled
(0.1
)
 
(2.8
)
Accretion expense
1.7

 
1.6

Net asset retirement obligations at December 31 (2)
$
34.8

 
$
28.1


(1)
Relates to the Jackalope Acquisition, which is further discussed in Note 3.
(2)
Includes $1.5 million and $0.5 million of current ARO liabilities at December 31, 2019 and 2018.