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v3.20.4

Other Long-term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Liabilities Noncurrent [Abstract] |
Schedule of 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 |
Changes in Aggregate Asset Retirement Obligations | 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.
Components of deferred revenue | 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 |
Changes in Deferred revenue | 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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