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Investment in American Transmission Company - Changes to Investment in ATC (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) member vote | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 29, 2015
Changes to investment in ATC |  |  |  |
Equity in earnings of transmission affiliate | $ 146.5 | $ 96.1 | $ 66.0 |
Capital contributions | $ 42.3 | 8.7 | 13.1 |
ATC |  |  |  |
Investment in ATC |  |  |  |
Equity interest in ATC | 60.00% |  |  | 26.20%
Number of representatives on ATC's board of directors | member | 1 |  |  |
Total number of members serving on ATC's board of directors | member | 10 |  |  |
Number of votes that can be placed by each member on ATC's board of directors | vote | 1 |  |  |
Number of members on ATC's board of directors with more than 10% voting control | member | 0 |  |  |
Maximum voting control of any member on ATC's board of directors | 10.00% |  |  |
Changes to investment in ATC |  |  |  |
Investment in ATC, balance at beginning of period | $ 1,380.9 | 424.1 | 402.7 |
Equity in earnings of transmission affiliate | 146.5 | 96.1 | 66.0 |
Capital contributions | 42.3 | 8.7 | 13.1 |
Acquisition of Integrys's investment in ATC | (1.0) | 541.5 | 0.0 |
Equity method goodwill from the acquisition of Integrys | 10.4 | 395.8 | 0.0 |
Distributions | 135.1 | 85.1 | 57.5 |
Other | 0.1 | 0.2 | 0.2 |
Investment in ATC, balance at end of period | 1,443.9 | $ 1,380.9 | $ 424.1 |
Dividends not received |  |  |  |
Dividends Receivable | $ 35.2 |  |  |

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