Derivative Financial Instruments (Details) (USD $)	3 Months Ended		6 Months Ended					3 Months Ended	6 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014 MMBTU	Jun. 30, 2013	Jun. 30, 2014 MMBTU	Jun. 30, 2013	Dec. 31, 2013 MMBTU	Dec. 31, 2012	Jun. 30, 2014 Foreign exchange contracts	Jun. 30, 2013 Derivatives designated as cash flow hedges Foreign exchange contracts	Jun. 30, 2014 Derivatives designated as cash flow hedges Foreign exchange contracts	Jun. 30, 2013 Derivatives designated as cash flow hedges Foreign exchange contracts	Dec. 31, 2013 Derivatives designated as cash flow hedges Foreign exchange contracts	Jun. 30, 2013 Derivatives designated as cash flow hedges Foreign exchange contracts Other operating - net	Jun. 30, 2013 Derivatives designated as cash flow hedges Foreign exchange contracts Other operating - net	Jun. 30, 2014 Derivatives not designated as cash flow hedges	Jun. 30, 2013 Derivatives not designated as cash flow hedges	Jun. 30, 2014 Derivatives not designated as cash flow hedges	Jun. 30, 2013 Derivatives not designated as cash flow hedges	Jun. 30, 2014 Derivatives not designated as cash flow hedges Natural gas derivatives Cost of sales	Jun. 30, 2013 Derivatives not designated as cash flow hedges Natural gas derivatives Cost of sales	Jun. 30, 2014 Derivatives not designated as cash flow hedges Natural gas derivatives Cost of sales	Jun. 30, 2013 Derivatives not designated as cash flow hedges Natural gas derivatives Cost of sales	Jun. 30, 2014 Derivatives not designated as cash flow hedges Foreign exchange contracts Other operating - net	Jun. 30, 2013 Derivatives not designated as cash flow hedges Foreign exchange contracts Other operating - net	Jun. 30, 2014 Derivatives not designated as cash flow hedges Foreign exchange contracts Other operating - net	Jun. 30, 2013 Derivatives not designated as cash flow hedges Foreign exchange contracts Other operating - net
Fair values of derivatives on consolidated statements of operations
Maximum period covering risk of changes in supply of gas prices			18 months
Open derivative contracts for natural gas (in MMBtus)	55,300,000		55,300,000		76,300,000
Percentage of natural gas consumption covered by derivatives			82.00%
Aggregate fair value of the derivative instruments with credit-risk-related contingent features in a net liability position	$ 3,200,000		$ 3,200,000		$ 200,000
Authorized expenditure for construction of new ammonia and urea/UAN production units						3,800,000,000
Notional amount of derivative							464,200,000		0
Gain (loss) reclassified from AOCI into income									0		0
Net gain (loss) expected to be reclassified into earnings from AOCI									0
Gain (loss) recognized in OCI								5,700,000		(6,500,000)
Unrealized gains (losses)
Derivatives not designated as hedges	(36,900,000)	(12,400,000)	(64,400,000)	(3,500,000)										(36,900,000)	(12,400,000)	(64,400,000)	(3,500,000)	(28,600,000)	(18,000,000)	(51,200,000)	4,400,000	(8,300,000)	5,600,000	(13,200,000)	(7,900,000)
Cash flow hedge ineffectiveness		(2,000,000)		(2,100,000)
Total unrealized gains (losses)	(36,900,000)	(14,400,000)	(64,400,000)	(5,600,000)
Realized gains (losses)	35,500,000	17,000,000	97,500,000	9,300,000
Net derivative gains (losses)	(1,400,000)	2,600,000	33,100,000	3,700,000								(2,000,000)	(2,100,000)
Cash collateral on deposit with derivative counterparties	$ 0		$ 0		$ 0