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Investment in American Transmission Company - Transactions with ATC (Details) - ATC - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investment in ATC |  |  |
Charges to ATC for services and construction | $ 18.5 | $ 15.4 | $ 8.1
Charges from ATC for network transmission services | 357.3 | 289.2 | $ 231.4
Accounts receivable for services provided to ATC | 2.2 | 1.0 |
Accounts payable for services received from ATC | $ 28.7 | $ 28.3 |

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