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Investment in Transmission Affiliates (Tables) | 12 Months Ended
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Dec. 31, 2018
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:
|  | 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 |  |  | $ | — |  |  | $ | 1,443.9 |
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 |  | * | — |  |  | 154.2 |
Less: Other |  | 0.2 |  |  | — |  |  | 0.2 |
Balance at December 31 |  | $ | 1,515.8 |  |  | $ | 37.6 |  |  | $ | 1,553.4 |
* | Of this amount, $39.9 million was recorded as a receivable from ATC in other current assets at December 31, 2017.
|  | ATC
(in millions) |  | 2016
Balance at January 1 |  | $ | 1,380.9 |
Add: Earnings from equity method investment |  | 146.5 |
Add: Capital contributions |  | 42.3 |
Add: Acquisition of Integrys's investment in ATC |  | (1.0 | )
Add: Equity method goodwill from the acquisition of Integrys (1) |  | 10.4 |
Less: Distributions (2) |  | 135.1 |
Less: Other |  | 0.1 |
Balance at December 31 |  | $ | 1,443.9 |
(1) | Represents an adjustment to the purchase price allocated to Integrys's investment in ATC in excess of the recorded value.
(2) | Of this amount, $35.2 million was recorded as a receivable from ATC in other current assets at December 31, 2016.
Schedule of significant transactions with ATC | The following table summarizes our significant related party transactions with ATC during the years ended December 31:
(in millions) |  | 2018 |  | 2017 |  | 2016
Charges to ATC for services and construction |  | $ | 21.8 |  |  | $ | 17.1 |  |  | $ | 18.5 |
Charges from ATC for network transmission services |  | 338.1 |  |  | 349.3 |  |  | 357.3 |
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, 2018 and 2017, our balance sheets included the following receivables and payables related to ATC:
(in millions) |  | 2018 |  | 2017
Accounts receivable |  |  |  |
Services provided to ATC |  | $ | 3.4 |  |  | $ | 1.5 |
Other current assets |  |  |  |
Dividends receivable from ATC |  | — |  |  | 39.9 |
Accounts payable |  |  |  |
Services received from ATC |  | 28.2 |  |  | 31.2 |
Schedule of summarized income statement data for ATC | Summarized financial data for ATC is included in the tables below:
(in millions) |  | 2018 |  | 2017 |  | 2016
Income statement data |  |  |  |  |  |
Operating revenues |  | $ | 690.5 |  |  | $ | 721.7 |  |  | $ | 650.8 |
Operating expenses |  | 358.7 |  |  | 345.0 |  |  | 322.5 |
Other expense, net |  | 108.3 |  |  | 104.1 |  |  | 95.5 |
Net income |  | $ | 223.5 |  |  | $ | 272.6 |  |  | $ | 232.8 |
Schedule of summarized balance sheet data for ATC |
(in millions) |  | December 31, 2018 |  | December 31, 2017
Balance sheet data |  |  |  |
Current assets |  | $ | 87.2 |  |  | $ | 87.7 |
Noncurrent assets |  | 4,928.8 |  |  | 4,598.9 |
Total assets |  | $ | 5,016.0 |  |  | $ | 4,686.6 |
Current liabilities |  | $ | 640.0 |  |  | $ | 767.2 |
Long-term debt |  | 2,014.0 |  |  | 1,790.6 |
Other noncurrent liabilities |  | 295.3 |  |  | 240.3 |
Shareholders' equity |  | 2,066.7 |  |  | 1,888.5 |
Total liabilities and shareholders' equity |  | $ | 5,016.0 |  |  | $ | 4,686.6 |

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