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v3.22.4

Investment in Transmission Affiliates - Changes to Investment in ATC (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) member vote | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Changes to investment in transmission affiliates |  |  |
Add: Capital contributions | $ 45.5 | $ 0.0 | $ 21.2
Transmission affiliates |  |  |
Changes to investment in transmission affiliates |  |  |
Investment in transmission affiliates, balance at beginning of period | 1,789.4 | 1,764.3 | 1,720.8
Add: Earnings from equity method investment | 194.7 | 158.1 | 175.8
Add: Capital contributions | 45.5 |  | 21.2
Less: Distributions | 120.4 | 133.0 | 146.7
Less: Return of capital |  |  | 6.8
Investment in transmission affiliates, balance at end of period | $ 1,909.2 | 1,789.4 | 1,764.3
ATC |  |  |
Investment in transmission affiliates |  |  |
Equity method investment, ownership interest (as a percent) | 60.00% |  |
Total number of members serving on the transmission affiliate's board of directors | member | 11 |  |
Number of representatives on the transmission affiliate's board of directors | member | 1 |  |
Number of votes that can be placed by each member on the transmission affiliate's board of directors | vote | 1 |  |
Liability for potential future refunds that ATC may be required to provide | $ 39.1 |  |
Changes to investment in transmission affiliates |  |  |
Investment in transmission affiliates, balance at beginning of period | 1,766.9 | 1,733.5 | 1,684.7
Add: Earnings from equity method investment | 192.6 | 166.4 | 174.3
Add: Capital contributions | 45.5 |  | 21.2
Less: Distributions | 120.4 | 133.0 | 146.7
Less: Return of capital |  |  | 0.0
Investment in transmission affiliates, balance at end of period | $ 1,884.6 | 1,766.9 | 1,733.5
ATC Holdco |  |  |
Investment in transmission affiliates |  |  |
Equity method investment, ownership interest (as a percent) | 75.00% |  |
Total number of members serving on the transmission affiliate's board of directors | member | 4 |  |
Number of representatives on the transmission affiliate's board of directors | member | 1 |  |
Number of votes that can be placed by each member on the transmission affiliate's board of directors | vote | 1 |  |
Changes to investment in transmission affiliates |  |  |
Investment in transmission affiliates, balance at beginning of period | $ 22.5 | 30.8 | 36.1
Add: Earnings from equity method investment | 2.1 | (8.3) | 1.5
Add: Capital contributions | 0.0 |  | 0.0
Less: Distributions | 0.0 | 0.0 | 0.0
Less: Return of capital |  |  | 6.8
Investment in transmission affiliates, balance at end of period | $ 24.6 | $ 22.5 | $ 30.8

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