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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units purchased (in units) | 400,000 |  |  |  |  |  |  |  |  | 400,000 |  |
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  |  | $ 14.4 | $ 0.0 | $ 78.3
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  | 19.3 | 68.0 | 0.0
Other income (expense), net |  | $ 0.3 | $ 5.0 | $ 0.1 | $ 0.3 | $ 0.2 | $ 0.3 | $ 0.2 | $ 36.0 | 5.7 | 36.7 | (3.7)
Sale proceeds |  |  |  |  |  |  |  |  |  | 4.9 |  |
Aggregate cost basis for available-for-sale securities |  |  |  |  |  | $ 47.9 |  |  |  |  | 47.9 | 73.6
Available-for-sale securities transferred to trading |  |  |  |  |  |  |  |  | $ 25.7 |  |  |
Proceeds from trading securities |  |  |  |  |  |  |  | $ 37.8 |  |  |  |
Realized gain on trading securities |  |  |  |  |  |  |  |  |  |  | 0.4 |
Other than temporary impairment losses |  |  |  |  |  |  |  |  |  |  |  | $ 4.7
Accumulated Net Unrealized Investment Gain | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  | $ 0.5 | 20.1 |
Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  | $ 11.7 |
East Dubuque Merger | CVR Partners, LP |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units purchased (in units) |  |  |  | 400,000 |  |  |  |  |  |  |  |

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