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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015
Fair value measurements
Common units purchased (in units)	400,000
Purchase of available-for-sale securities						$ 14.4	$ 0.0
Realized gain on sale of marketable securities classified as held-for-sale		$ 4.9				4.9
Proceeds from sale of available-for-sale securities						19.3	68.0
Aggregate cost basis				$ 47.9			47.9
Other income, net		$ 5.0		0.3		5.5	36.6
Aggregate cost basis, AFS securities reclassified to trading securities								$ 25.7
Proceeds from sale of trading securities					$ 37.8
Realized gain				$ 0.4
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss)
Fair value measurements
Other income, net						$ 0.5	20.1
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities
Fair value measurements
Other income, net							$ 11.7
East Dubuque Merger | CVR Partners, LP
Fair value measurements
Common units purchased (in units)			400,000

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-Section S99
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