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Investments in Unconsolidated Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity Method Investments And Joint Ventures [Abstract] |
Activity Related to Partnership's Investments and Combined Financial Information in Unconsolidated Affiliates | The following table shows the activity related to our investments in unconsolidated affiliates:
|  | Balance at December 31, 2017 |  |  | Equity Earnings (Loss) |  |  | Cash Distributions (1) |  |  | Acquisition (Disposition) |  |  | Contributions (2) |  |  | Balance at December 31, 2018 |
GCX (3) |  | $ | — |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 210.8 |  |  | $ | 211.6 |
Little Missouri 4 |  |  | — |  |  |  | — |  |  |  | (8.0 | ) |  |  | — |  |  |  | 75.3 |  |  |  | 67.3 |
T2 Eagle Ford |  |  | 109.2 |  |  |  | (10.2 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 99.0 |
T2 LaSalle |  |  | 54.1 |  |  |  | (4.9 | ) |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | 49.3 |
GCF |  |  | 45.8 |  |  |  | 16.8 |  |  |  | (22.3 | ) |  |  | — |  |  |  | — |  |  |  | 40.3 |
Cayenne |  |  | 8.6 |  |  |  | 6.4 |  |  |  | (4.0 | ) |  |  | — |  |  |  | 5.6 |  |  |  | 16.6 |
T2 EF Cogen |  |  | 3.9 |  |  |  | (1.8 | ) |  |  | — |  |  |  | (2.1 | ) |  |  | — |  |  |  | — |
Agua Blanca |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | 3.5 |  |  |  | 2.7 |  |  |  | 6.4 |
Total |  | $ | 221.6 |  |  | $ | 7.3 |  |  | $ | (34.3 | ) |  | $ | 1.4 |  |  | $ | 294.5 |  |  | $ | 490.5 |
|  | Balance at December 31, 2018 |  |  | Equity Earnings (Loss) |  |  | Cash Distributions |  |  | Disposition |  |  | Contributions |  |  | Balance at December 31, 2019 |
GCX (3) |  | $ | 211.6 |  |  | $ | 27.7 |  |  | $ | (25.3 | ) |  | $ | — |  |  | $ | 233.5 |  |  | $ | 447.5 |
Little Missouri 4 |  |  | 67.3 |  |  |  | 3.4 |  |  |  | — |  |  |  | — |  |  |  | 33.0 |  |  |  | 103.7 |
T2 Eagle Ford |  |  | 99.0 |  |  |  | (9.4 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 89.6 |
T2 LaSalle |  |  | 49.3 |  |  |  | (4.5 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 44.8 |
GCF |  |  | 40.3 |  |  |  | 16.1 |  |  |  | (19.2 | ) |  |  | — |  |  |  | — |  |  |  | 37.2 |
Cayenne |  |  | 16.6 |  |  |  | 7.2 |  |  |  | (8.2 | ) |  |  | — |  |  |  | 0.3 |  |  |  | 15.9 |
Agua Blanca |  |  | 6.4 |  |  |  | (1.5 | ) |  |  | (0.4 | ) |  |  | (4.5 | ) |  |  | — |  |  |  | — |
Total |  | $ | 490.5 |  |  | $ | 39.0 |  |  | $ | (53.1 | ) |  | $ | (4.5 | ) |  | $ | 266.8 |  |  | $ | 738.7 |
|  | Balance at December 31, 2019 |  |  | Equity Earnings (Loss) |  |  | Cash Distributions |  |  | Disposition |  |  | Contributions |  |  | Balance at December 31, 2020 |
GCX (3) |  | $ | 447.5 |  |  | $ | 66.3 |  |  | $ | (81.3 | ) |  | $ | — |  |  | $ | 2.7 |  |  | $ | 435.2 |
Little Missouri 4 |  |  | 103.7 |  |  |  | 10.8 |  |  |  | (9.8 | ) |  |  | — |  |  |  | — |  |  |  | 104.7 |
T2 Eagle Ford (4) |  |  | 89.6 |  |  |  | (8.9 | ) |  |  | (0.9 | ) |  |  | — |  |  |  | — |  |  |  | 79.8 |
T2 LaSalle (4) |  |  | 44.8 |  |  |  | (4.8 | ) |  |  | (0.4 | ) |  |  | — |  |  |  | — |  |  |  | 39.6 |
GCF (5) |  |  | 37.2 |  |  |  | 2.9 |  |  |  | (1.6 | ) |  |  | — |  |  |  | — |  |  |  | 38.5 |
Cayenne |  |  | 15.9 |  |  |  | 6.3 |  |  |  | (6.0 | ) |  |  | — |  |  |  | — |  |  |  | 16.2 |
Total |  | $ | 738.7 |  |  | $ | 72.6 |  |  | $ | (100.0 | ) |  | $ | — |  |  | $ | 2.7 |  |  | $ | 714.0 |
(1) | Includes an $8.0 million distribution from Little Missouri 4 as a reimbursement of pre-formation expenditures.
(2) | Includes a $16.0 million initial contribution of property, plant and equipment to Little Missouri 4.
(3) | As discussed in Note 4 –Joint Ventures and Divestitures, our 25% interest in GCX is owned by GCX DevCo JV, of which we own a 20% interest. GCX DevCo JV is accounted for on a consolidated basis in our consolidated financial statements.
(4) | The carrying values of the T2 Joint Ventures include the effects of the Atlas Merger purchase accounting, which determined fair values for the joint ventures as of the date of acquisition. As of December 31, 2020, $21.6 million of unamortized excess fair value over the T2 LaSalle and T2 Eagle Ford capital accounts remained. These basis differences, which are attributable to the underlying depreciable tangible gathering assets, are being amortized on a straight-line basis as components of equity earnings over the estimated 20-year useful lives of the underlying assets.
(5) | Targa will assume operatorship of GCF in the first half of 2021.

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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