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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units purchased (in units) | 400,000 |  |  |  |  |  |  |  |  |  |  |
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 14.4 | $ 0.0
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  | 0.0 | 19.3 | 68.0
Other income, net |  | $ 0.9 | $ 0.0 | $ 0.1 | $ 0.0 | $ 0.3 | $ 5.0 | $ 0.1 | $ 0.3 | $ 1.0 | 5.7 | $ 36.7
Sale proceeds |  |  |  |  |  |  |  |  |  |  | 4.9 |
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, net |  |  |  |  |  |  |  |  |  |  | $ 0.5 |
CVR Partners, LP | East Dubuque Merger |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units purchased (in units) |  |  |  |  |  |  |  | 400,000 |  |  |  |

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