Financing Agreements (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014 item	May 01, 2012	Dec. 31, 2013	Apr. 22, 2013	Apr. 23, 2010	May 23, 2013	Mar. 11, 2014
Unsecured Debt [Abstract]
Long-term debt	$ 4,592,500,000		$ 3,098,100,000
Long-term debt	4,592,500,000		3,098,100,000
Long-term debt, fair value	4,969,300,000		3,276,700,000
Credit Agreement
Debt Instruments
Maximum borrowing capacity				1,000,000,000.0
Threshold of potential guarantor obligation	350,000,000
Number of subsidiaries that provided guarantee obligations	0
CF Industries
Unsecured Debt [Abstract]
Amount outstanding	0		0
Repurchase price of notes as a percentage of principal amount	101.00%
CF Industries | Credit Agreement
Debt Instruments
Maximum borrowing capacity		500,000,000
Maturity period		5 years
Available credit	995,100,000
Line of credit facility, amount outstanding	0		0
Letters of credit outstanding, amount	4,900,000
CF Industries | Unsecured senior notes 6.875% due 2018
Unsecured Debt [Abstract]
Long-term debt	800,000,000		800,000,000
Principal amount					800,000,000
Interest rate (as a percent)					6.875%
CF Industries | Unsecured senior notes 7.125% due 2020
Unsecured Debt [Abstract]
Long-term debt	800,000,000		800,000,000
Principal amount					800,000,000
Interest rate (as a percent)					7.125%
CF Industries | Unsecured senior notes 3.450% due 2023
Unsecured Debt [Abstract]
Long-term debt	749,400,000		749,300,000
Principal amount						750,000,000
Interest rate (as a percent)						3.45%
CF Industries | Unsecured senior notes 5.150% due 2034
Unsecured Debt [Abstract]
Long-term debt	746,200,000		0
Principal amount						750,000,000
Interest rate (as a percent)							5.15%
CF Industries | Unsecured senior notes 4.950% due 2043
Unsecured Debt [Abstract]
Long-term debt	748,800,000		748,800,000
Principal amount						750,000,000
Interest rate (as a percent)						4.95%
CF Industries | Unsecured senior notes 5.375% due 2044
Unsecured Debt [Abstract]
Long-term debt	748,100,000		0
Principal amount							750,000,000
Interest rate (as a percent)							5.375%
CF Industries | Senior notes due 2018 and 2020
Unsecured Debt [Abstract]
Long-term debt	1,600,000,000
Long-term debt, fair value	1,900,000,000
CF Industries | Senior Notes due 2023 and 2043
Unsecured Debt [Abstract]
Long-term debt	1,500,000,000
Net proceeds from issuance and sale of notes	1,480,000,000
Long-term debt, fair value	1,500,000,000
CF Industries | Senior Notes due 2034 and 2044
Unsecured Debt [Abstract]
Long-term debt	1,500,000,000
Net proceeds from issuance and sale of notes	1,480,000,000
Long-term debt, fair value	$ 1,600,000,000