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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair value measurements
Common units purchased (in units)		400,000
Purchase of available-for-sale securities	$ 4.2				$ 4.2	$ 0.0
Unrealized gain on available-for-sale securities	$ 0.5		$ 0.5		0.5
Proceeds from sale of available-for-sale securities					0.0	68.0
Aggregate cost basis				$ 47.9		47.9
Other income, net			$ 0.1	0.2	$ 0.4	36.3
Aggregate cost basis, AFS securities reclassified to trading securities				25.7		25.7
Proceeds from sale of trading securities				37.8
Realized gain on trading securities				$ 0.4		0.4
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
East Dubuque Merger | CVR Partners, LP
Fair value measurements
Common units purchased (in units)			400,000

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