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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2016 | Mar. 31, 2015
Fair value measurements |  |  |
Common units purchased | 400,000 |  |
Proceeds from sale of available-for-sale securities |  | $ 0.0 | $ 42.1
Receivable for sale of available-for-sale securities included in prepaid expenses and other current assets | $ 25.9 | 25.9 |
Aggregate cost basis | 47.9 | 47.9 |
Other income, net |  | 0.3 | $ 36.0
Aggregate cost basis, AFS securities reclassified to trading securities | $ 25.7 | 25.7 |
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss) |  |  |
Fair value measurements |  |  |
Other income, net |  | 20.1 |
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities |  |  |
Fair value measurements |  |  |
Other income, net |  | $ 11.7 |

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