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INVESTMENT IN AMERICAN TRANSMISSION COMPANY - CHANGES TO INVESTMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Changes to investment in ATC |  |  |  |  |
Investment in ATC, balance at beginning of period |  |  | $ 1,443.9 |  |
Add: Earnings from equity method investment | $ 41.8 | $ 30.9 | 83.7 | $ 69.4 |
Investment in ATC, balance at end of period | $ 1,544.0 |  | $ 1,544.0 |  |
ATC |  |  |  |  |
Investment in ATC |  |  |  |  |
Ownership interest in ATC (as a percent) | 60.00% |  | 60.00% |  |
Changes to investment in ATC |  |  |  |  |
Investment in ATC, balance at beginning of period | $ 1,422.5 | 1,513.3 | $ 1,443.9 | 1,380.9 |
Add: Earnings from equity method investment | 41.8 | 30.9 | 83.7 | 69.4 |
Add: Capital contributions | 22.9 | 3.1 | 50.5 | 12.1 |
Acquisition of Integrys's investment in ATC | 0.0 | (1.0) | 0.0 | (1.0) |
Add: Adjustment to equity method goodwill | 0.0 | 1.1 | 0.0 | 10.4 |
Less: Distributions | 34.0 | 31.6 | 34.0 | 46.7 |
Less: Other | 0.0 | 0.0 | 0.1 | 0.1 |
Investment in ATC, balance at end of period | $ 1,544.0 | $ 1,425.0 | $ 1,544.0 | $ 1,425.0 |
Dividends Receivable |  |  |  |  | $ 35.2

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