Other Long-term Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Other Liabilities Noncurrent [Abstract]

Schedule of Other Long-term Liabilities

Other long-term liabilities are comprised of the following obligations:

	December 31, 2021		December 31, 2020
Deferred revenue	$	171.8	$	168.5
Asset retirement obligations		72.1		68.3
Operating lease liabilities		34.5		46.2
Other liabilities		23.2		26.1
Total long-term liabilities	$	301.6	$	309.1

Components of deferred revenue

The following table shows the components of deferred revenue:

	December 31, 2021		December 31, 2020
Splitter agreement	$	129.0	$	129.0
Gas contract amendment		34.8		37.3
Other		8.0		2.2
Total deferred revenue	$	171.8	$	168.5

Changes in Deferred revenue

The following table shows the changes in deferred revenue:

	2021			2020
Balance at beginning of period	$	168.5		$	172.0
Additions		7.2			0.3
Revenue recognized		(3.9	)		(3.8	)
Balance at end of period	$	171.8		$	168.5

Changes in Aggregate Asset Retirement Obligations

The changes in our ARO are as follows:

	2021			2020
Beginning of period	$	68.3		$	66.3
Accretion expense		4.0			3.6
Retirement of ARO		—			0.2
Change in cash flow estimate		(0.2	)		(1.8	)
End of period	$	72.1		$	68.3