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Investment in Transmission Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity Method Investments and Joint Ventures [Abstract] |
Schedule of changes to our investment in ATC | The following tables provide a reconciliation of the changes in our investments in ATC and ATC Holdco:
|  | 2019
(in millions) |  | ATC |  | ATC Holdco |  | Total
Balance at January 1 |  | $ | 1,625.3 |  |  | $ | 40.0 |  |  | $ | 1,665.3 |
Add: Earnings (loss) from equity method investment * |  | 132.8 |  |  | (5.2 | ) |  | 127.6 |
Add: Capital contributions |  | 51.3 |  |  | 1.3 |  |  | 52.6 |
Less: Distributions |  | 124.7 |  |  | — |  |  | 124.7 |
Balance at December 31 |  | $ | 1,684.7 |  |  | $ | 36.1 |  |  | $ | 1,720.8 |
* | In November 2019, the FERC issued an order that addressed the complaints related to ATC's allowed ROE. Due to the numerous rehearing requests filed related to this order, our financials continue to include a $41.9 million liability for potential future refunds that ATC may be required to provide, resulting in reduced equity earnings from ATC. This liability reflects a 10.38% ROE for all periods covered by the complaints.
|  | 2018
(in millions) |  | ATC |  | ATC Holdco |  | Total
Balance at January 1 |  | $ | 1,515.8 |  |  | $ | 37.6 |  |  | $ | 1,553.4 |
Add: Earnings (loss) from equity method investment |  | 139.6 |  |  | (2.9 | ) |  | 136.7 |
Add: Capital contributions |  | 48.2 |  |  | 5.3 |  |  | 53.5 |
Less: Distributions |  | 78.2 |  |  | — |  |  | 78.2 |
Less: Other |  | 0.1 |  |  | — |  |  | 0.1 |
Balance at December 31 |  | $ | 1,625.3 |  |  | $ | 40.0 |  |  | $ | 1,665.3 |
|  | 2017
(in millions) |  | ATC |  | ATC Holdco |  | Total
Balance at January 1 |  | $ | 1,443.9 |  | (1) | $ | — |  |  | $ | 1,443.9 |
Add: Earnings (loss) from equity method investment |  | 166.0 |  |  | (11.7 | ) |  | 154.3 |
Add: Capital contributions |  | 60.3 |  |  | 49.3 |  |  | 109.6 |
Less: Distributions |  | 154.2 |  | (2) | — |  |  | 154.2 |
Less: Other |  | 0.2 |  |  | — |  |  | 0.2 |
Balance at December 31 |  | $ | 1,515.8 |  |  | $ | 37.6 |  |  | $ | 1,553.4 |
(1) | Distributions of $35.2 million, received in the first quarter of 2017, were approved and recorded as a receivable from ATC in other current assets at December 31, 2016.
(2) Of this amount, $39.9 million was recorded as a receivable from ATC in other current assets at December 31, 2017.
Schedule of significant related party transactions with ATC | The following table summarizes our significant related party transactions with ATC during the years ended December 31:
(in millions) |  | 2019 |  | 2018 |  | 2017
Charges to ATC for services and construction |  | $ | 25.9 |  |  | $ | 21.8 |  |  | $ | 17.1 |
Charges from ATC for network transmission services |  | 348.1 |  |  | 338.1 |  |  | 349.3 |
Refund from ATC related to a FERC audit |  | — |  |  | 22.0 |  |  | — |
Refund from ATC per FERC ROE order |  | — |  |  | — |  |  | 28.3 |
Schedule of receivables and payables with ATC | As of December 31, 2019 and 2018, our balance sheets included the following receivables and payables for services received from or provided to ATC:
(in millions) |  | 2019 |  | 2018 |
Accounts receivable for services provided to ATC |  | $ | 3.5 |  |  | $ | 3.4 |  |
Accounts payable for services received from ATC |  | 29.0 |  |  | 28.2 |  |
Amounts due from ATC for transmission infrastructure upgrades |  | 2.8 |  | (1) | 29.4 |  | (2)
(1) | In connection with WPS's construction of its two new solar projects, Badger Hollow I and Two Creeks, WPS was required to initially fund the construction of the transmission infrastructure upgrades needed for the new generation. ATC owns these transmission assets and will reimburse WPS for these costs after the new generation has been placed in service.
(2) | In connection with UMERC's construction of the new natural gas-fired generation in the Upper Peninsula of Michigan, UMERC was required to initially fund the construction of the transmission infrastructure upgrades owned by ATC that were needed for the new generation. In the second quarter of 2019, ATC fully reimbursed UMERC for these costs.
Schedule of summarized income statement data for ATC | Summarized financial data for ATC is included in the tables below:
|  | Year Ended December 31
(in millions) |  | 2019 |  | 2018 |  | 2017
Income statement data |  |  |  |  |  |
Operating revenues |  | $ | 744.4 |  |  | $ | 690.5 |  |  | $ | 721.7 |
Operating expenses |  | 373.5 |  |  | 358.7 |  |  | 345.0 |
Other expense, net |  | 110.5 |  |  | 108.3 |  |  | 104.1 |
Net income |  | $ | 260.4 |  |  | $ | 223.5 |  |  | $ | 272.6 |
Schedule of summarized balance sheet data for ATC |
(in millions) |  | December 31, 2019 |  | December 31, 2018
Balance sheet data |  |  |  |
Current assets |  | $ | 84.7 |  |  | $ | 87.2 |
Noncurrent assets |  | 5,244.2 |  |  | 4,928.8 |
Total assets |  | $ | 5,328.9 |  |  | $ | 5,016.0 |
Current liabilities |  | $ | 502.6 |  |  | $ | 640.0 |
Long-term debt |  | 2,312.8 |  |  | 2,014.0 |
Other noncurrent liabilities |  | 298.9 |  |  | 295.3 |
Shareholders' equity |  | 2,214.6 |  |  | 2,066.7 |
Total liabilities and shareholders' equity |  | $ | 5,328.9 |  |  | $ | 5,016.0 |

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