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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Changes to investments in transmission affiliates |  |  |  |  |
Investment in transmission affiliates, balance at beginning of period | $ 1,696.5 | $ 1,596.6 | $ 1,665.3 | $ 1,553.4 |
Add: Earnings (loss) from equity method investment | 38.7 | 33.7 | 111.7 | 95.2 |
Add: Capital contributions | 15.4 | 11.3 | 37.3 | 43.7 |
Less: Distributions | 30.3 | 27.8 | 93.9 | 78.5 |
Other | 0.1 | 0.1 |  | 0.1 |
Investment in transmission affiliates, balance at end of period | $ 1,720.4 | 1,613.7 | $ 1,720.4 | 1,613.7 |
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 | $ 1,656.6 | 1,558.4 | $ 1,625.3 | 1,515.8 |
Add: Earnings (loss) from equity method investment | 38.3 | 34.6 | 112.2 | 97.8 |
Add: Capital contributions | 15.1 | 9.1 | 36.2 | 39.2 |
Less: Distributions | 30.3 | 27.8 | 93.9 | 78.5 |
Other | 0.1 | 0.1 |  | 0.1 |
Investment in transmission affiliates, balance at end of period | $ 1,679.8 | 1,574.2 | $ 1,679.8 | 1,574.2 |
Dividends receivable from ATC |  | 27.7 |  | 27.7 | $ 39.9
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 | $ 39.9 | 38.2 | $ 40.0 | 37.6 |
Add: Earnings (loss) from equity method investment | 0.4 | (0.9) | (0.5) | (2.6) |
Add: Capital contributions | 0.3 | 2.2 | 1.1 | 4.5 |
Less: Distributions | 0.0 | 0.0 | 0.0 | 0.0 |
Other | 0.0 | 0.0 |  | 0.0 |
Investment in transmission affiliates, balance at end of period | $ 40.6 | $ 39.5 | $ 40.6 | $ 39.5 |

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