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Other Long-term Liabilities | 12 Months Ended
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Dec. 31, 2020
Other Liabilities Noncurrent [Abstract] |
Other Long-term Liabilities | Note 9 — Other Long-term Liabilities Other long-term liabilities are comprised of the following obligations:
|  | December 31, 2020 |  |  | December 31, 2019 |
Deferred revenue |  | $ | 168.5 |  |  | $ | 172.0 |
Asset retirement obligations |  |  | 68.3 |  |  |  | 66.3 |
Operating lease liabilities |  |  | 46.2 |  |  |  | 47.2 |
Other liabilities |  |  | 26.1 |  |  |  | 20.1 |
Total long-term liabilities |  | $ | 309.1 |  |  | $ | 305.6 |
Asset Retirement Obligations Our ARO primarily relate to certain gas gathering pipelines and processing facilities and NGL pipelines. The changes in our ARO are as follows:
|  | 2020 |  |  | 2019 |
Beginning of period |  | $ | 66.3 |  |  | $ | 55.5 |
Additions (1) |  |  | — |  |  |  | 11.8 |
Change in cash flow estimate |  |  | (1.8 | ) |  |  | (5.1 | )
Accretion expense |  |  | 3.6 |  |  |  | 4.7 |
Retirement of ARO |  |  | 0.2 |  |  |  | (0.6 | )
End of period |  | $ | 68.3 |  |  | $ | 66.3 |
(1) | Amount reflects additions of ARO related to the commencement of operations of Grand Prix.
Deferred Revenue Deferred revenue for the years ended December 31, 2020 and 2019, was $168.5 million and $172.0 million, respectively, which includes $129.0 million of payments received from Vitol Americas Corp. (“Vitol”) (formerly known as Noble Americas Corp.), a subsidiary of Vitol US Holding Co. The payments were received in 2016, 2017, and 2018 as part of an agreement (the “Splitter Agreement”) related to the construction and operation of a crude oil and condensate splitter. In December 2018, Vitol elected to terminate the Splitter Agreement. The Splitter Agreement provides that the first three annual payments are ours if Vitol elects to terminate, which Vitol disputes. The timing of revenue recognition related to the Splitter Agreement deferred revenue is dependent upon resolution of the dispute with Vitol. Deferred revenue also includes nonmonetary consideration received in a 2015 amendment (the “gas contract amendment”) to a gas gathering and processing agreement. We measured the estimated fair value of the gathering assets transferred to us using significant other observable inputs representative of a Level 2 fair value measurement. In December 2017, we received monetary consideration to further amend the terms of the gas gathering and processing agreement. The deferred revenue related to these amendments is being recognized on a straight-line basis through the end of the agreement’s term in 2035. Deferred revenue also includes consideration received for other construction activities of facilities connected to our systems. The deferred revenue related to these other construction activities is being recognized over the periods that future performance will be provided, which extend through 2023. For the years ended December 31, 2020, 2019 and 2018, we recognized approximately $3.8 million, $3.9 million and $3.9 million of revenue for these transactions, respectively. The following table shows the components of deferred revenue:
|  | December 31, 2020 |  |  | December 31, 2019 |
Splitter agreement |  | $ | 129.0 |  |  | $ | 129.0 |
Gas contract amendment |  |  | 37.3 |  |  |  | 39.8 |
Other deferred revenue |  |  | 2.2 |  |  |  | 3.2 |
Total deferred revenue |  | $ | 168.5 |  |  | $ | 172.0 |
The following table shows the changes in deferred revenue:
|  | 2020 |  |  | 2019 |
Balance at beginning of period |  | $ | 172.0 |  |  | $ | 175.5 |
Additions |  |  | 0.3 |  |  |  | 0.4 |
Revenue recognized |  |  | (3.8 | ) |  |  | (3.9 | )
Balance at end of period |  | $ | 168.5 |  |  | $ | 172.0 |

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