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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Changes to investments in transmission affiliates |  |  |  |
Add: Earnings from equity method investment | $ 63.7 | $ 42.3 | $ 148.4 | $ 126.2
Add: Capital contributions |  |  | 39.4 | 0.0
Transmission Affiliates |  |  |  |
Changes to investments in transmission affiliates |  |  |  |
Investment in transmission affiliates, balance at beginning of period | 1,837.2 | 1,782.0 | 1,789.4 | 1,764.3
Add: Earnings from equity method investment | 63.7 | 42.3 | 148.4 | 126.2
Add: Capital contributions | 9.1 |  | 39.4 |
Less: Distributions | 34.1 | 33.0 | 101.3 | 99.2
Investment in transmission affiliates, balance at end of period | $ 1,875.9 | 1,791.3 | $ 1,875.9 | 1,791.3
ATC |  |  |  |
Investment in transmission affiliates |  |  |  |
Equity method investment, ownership interest (as a percent) | 60.00% |  | 60.00% |
Changes to investments in transmission affiliates |  |  |  |
Investment in transmission affiliates, balance at beginning of period | $ 1,813.6 | 1,749.7 | $ 1,766.9 | 1,733.5
Add: Earnings from equity method investment | 63.2 | 41.7 | 146.8 | 124.1
Add: Capital contributions | 9.1 |  | 39.4 |
Less: Distributions | 34.1 | 33.0 | 101.3 | 99.2
Investment in transmission affiliates, balance at end of period | $ 1,851.8 | 1,758.4 | $ 1,851.8 | 1,758.4
ATC Holdco |  |  |  |
Investment in transmission affiliates |  |  |  |
Equity method investment, ownership interest (as a percent) | 75.00% |  | 75.00% |
Changes to investments in transmission affiliates |  |  |  |
Investment in transmission affiliates, balance at beginning of period | $ 23.6 | 32.3 | $ 22.5 | 30.8
Add: Earnings from equity method investment | 0.5 | 0.6 | 1.6 | 2.1
Add: Capital contributions | 0.0 |  | 0.0 |
Less: Distributions | 0.0 | 0.0 | 0.0 | 0.0
Investment in transmission affiliates, balance at end of period | $ 24.1 | $ 32.9 | $ 24.1 | $ 32.9

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