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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Changes to investments in transmission affiliates |  |  |  |
Add: Earnings from equity method investment | $ 42.3 | $ 40.1 | $ 126.2 | $ 132.8
Add: Capital contributions |  |  | 0.0 | 15.2
Transmission Affiliates |  |  |  |
Changes to investments in transmission affiliates |  |  |  |
Investment in transmission affiliates, balance at beginning of period | 1,782.0 | 1,744.7 | 1,764.3 | 1,720.8
Add: Earnings from equity method investment | 42.3 | 40.1 | 126.2 | 132.8
Add: Capital contributions |  | 6.2 |  | 15.2
Less: Distributions | 33.0 | 39.9 | 99.2 | 112.5
Less: Return of capital |  | 0.6 |  | 5.9
Less: Other |  | 0.1 |  |
Investment in transmission affiliates, balance at end of period | $ 1,791.3 | 1,750.4 | $ 1,791.3 | 1,750.4
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 | $ 1,749.7 | 1,713.3 | $ 1,733.5 | 1,684.7
Add: Earnings from equity method investment | 41.7 | 39.6 | 124.1 | 131.7
Add: Capital contributions |  | 6.2 |  | 15.2
Less: Distributions | 33.0 | 39.9 | 99.2 | 112.5
Less: Return of capital |  | 0.0 |  | 0.0
Less: Other |  | 0.1 |  |
Investment in transmission affiliates, balance at end of period | $ 1,758.4 | 1,719.1 | $ 1,758.4 | 1,719.1
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 | $ 32.3 | 31.4 | $ 30.8 | 36.1
Add: Earnings from equity method investment | 0.6 | 0.5 | 2.1 | 1.1
Add: Capital contributions |  | 0.0 |  | 0.0
Less: Distributions | 0.0 | 0.0 | 0.0 | 0.0
Less: Return of capital |  | 0.6 |  | 5.9
Less: Other |  | 0.0 |  |
Investment in transmission affiliates, balance at end of period | $ 32.9 | $ 31.3 | $ 32.9 | $ 31.3

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