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GOODWILL AND INTANGIBLES | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL | GOODWILL AND INTANGIBLES Goodwill Goodwill represents the excess of the cost of an acquisition over the fair value of the identifiable net assets acquired. The table below shows our goodwill balances by segment at March 31, 2021. We had no changes to the carrying amount of goodwill during the three months ended March 31, 2021.
(in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Non-Utility Energy Infrastructure |  | Total
Goodwill balance (1) |  | $ | 2,104.3 |  |  | $ | 758.7 |  |  | $ | 183.2 |  |  | $ | 6.6 |  |  | $ | 3,052.8 |
(1)We had no accumulated impairment losses related to our goodwill as of March 31, 2021. Intangible Assets At March 31, 2021, we had $5.7 million of indefinite-lived intangible assets primarily related to a MGU trade name obtained through an acquisition, which is included in other long-term assets on our balance sheets. We had no changes to the carrying amount of these intangible assets during the three months ended March 31, 2021. Intangible Liabilities The intangible liabilities below were all obtained through acquisitions by WECI and are classified as other long-term liabilities on our balance sheets. See Note 2, Acquisitions, for more information.
|  | March 31, 2021 |  | December 31, 2020
(in millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
PPAs (1) |  | $ | 84.6 |  |  | $ | (1.6) |  |  | $ | 83.0 |  |  | $ | 76.1 |  |  | $ | — |  |  | $ | 76.1 |
Proxy revenue swap (2) |  | 7.2 |  |  | (1.5) |  |  | 5.7 |  |  | 7.2 |  |  | (1.3) |  |  | 5.9 |
Interconnection agreements (3) |  | 5.1 |  |  | (0.4) |  |  | 4.7 |  |  | 5.1 |  |  | (0.3) |  |  | 4.8 |
Total intangible liabilities |  | $ | 96.9 |  |  | $ | (3.5) |  |  | $ | 93.4 |  |  | $ | 88.4 |  |  | $ | (1.6) |  |  | $ | 86.8 |
(1) Represents PPAs related to the acquisition of Blooming Grove, Tatanka Ridge, and Jayhawk expiring between 2030 and 2032. The weighted-average remaining useful life of the PPAs is approximately 11 years. (2) Represents an agreement with a counterparty to swap the market revenue of Upstream's wind generation for fixed quarterly payments over 10 years, which expires in 2029. The remaining useful life of the proxy revenue swap is approximately eight years. (3) Represents interconnection agreements related to the acquisitions of Tatanka Ridge and Bishop Hill III, expiring in 2040 and 2041, respectively. These agreements relate to payments for connecting our facilities to the infrastructure of another utility to facilitate the movement of power onto the electric grid. The weighted-average remaining useful life of the interconnection agreements is approximately 20 years. Amortization related to these intangibles for the three months ended March 31, 2021 and 2020, was not significant. Amortization for the next five years is estimated to be:
|  | For the Years Ending December 31
(in millions) |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
Amortization to be recorded in operating revenues |  | $ | 8.1 |  |  | $ | 8.1 |  |  | $ | 8.1 |  |  | $ | 8.1 |  |  | $ | 8.1 |
Amortization to be recorded in other operation and maintenance |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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