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Other Income, net (Tables) | 12 Months Ended
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Dec. 31, 2016
Other Income, net [Abstract] |
Schedule of Other Nonoperating Income (Expense) [Table Text Block] | Total other income, net was as follows for the years ended December 31:
(in millions) |  | 2016 |  | 2015 |  | 2014
AFUDC – Equity |  | $ | 25.1 |  |  | $ | 20.1 |  |  | $ | 5.6 |
Gain on repurchase of notes |  | 23.6 |  |  | — |  |  | — |
Gain on asset sales |  | 19.6 |  |  | 22.9 |  |  | 7.5 |
Other, net |  | 12.5 |  |  | 15.9 |  |  | 0.3 |
Other income, net |  | $ | 80.8 |  |  | $ | 58.9 |  |  | $ | 13.4 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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- Definition Other Income, net [Abstract] + References No definition available. + Details
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