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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Net Amounts of Goodwill | At December 31, 2020, we had $45.2 million of goodwill included in Other long-term assets on the Consolidated Balance Sheets. Changes in the net amounts of our goodwill are as follows:
|  | New Midland |  |  | New Delaware |  |  | Delaware Supersystem |  |  | Permian Midland |  |  | Permian Delaware |  |  | Total |
Balance as of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 23.2 |  |  | $ | 23.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 46.6 |
Accumulated impairment losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net |  |  | 23.2 |  |  |  | 23.4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 46.6 |
Impairment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reporting unit aggregation (1) |  |  | — |  |  |  | (23.4 | ) |  |  | 23.4 |  |  |  | — |  |  |  | — |  |  |  | — |
Balance as of December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 23.2 |  |  |  | — |  |  |  | 23.4 |  |  |  | — |  |  |  | — |  |  |  | 46.6 |
Goodwill allocated to held for sale assets |  |  | — |  |  |  | — |  |  |  | (1.4 | ) |  |  | — |  |  |  | — |  |  |  | (1.4 | )
Accumulated impairment losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net |  |  | 23.2 |  |  |  | — |  |  |  | 22.0 |  |  |  | — |  |  |  | — |  |  |  | 45.2 |
Impairment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Reporting unit aggregation (2) |  |  | (23.2 | ) |  |  | — |  |  |  | (22.0 | ) |  |  | 23.2 |  |  |  | 22.0 |  |  |  | — |
Balance as of December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 23.2 |  |  |  | 22.0 |  |  |  | 45.2 |
Accumulated impairment losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 23.2 |  |  | $ | 22.0 |  |  | $ | 45.2 |
| (1) | In 2019, we began aggregating the results of Delaware Supersystem activity, including New Delaware. Discrete financial information for New Delaware is no longer available and management now reviews aggregate Delaware Supersystem operating results.
| (2) | In 2020, as a result of the high degree of operational integration of our Permian gathering and processing assets and management’s increased focus and review of combined operating results within our Permian Midland and Permian Delaware regions, we further aggregated our New Midland and Permian Supersystem reporting units into the Permian Midland and Permian Delaware reporting units, respectively.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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