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Financing Agreements (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing agreements
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 500.0
Line of Credit Facility, Interest Rate During Period		2.05%
Debt Instruments
Principal	3,500.0		$ 4,000.0
Carrying amount	3,465.0		3,961.0
Current Maturities of long-term debt	0.0		250.0
Current maturities of long-term debt	0.0		249.0
Long-term debt, net of current maturities	3,465.0		3,712.0
Long-term debt, net of current maturities	3,500.0		3,750.0
CF Industries
Debt Instruments
Unamortized debt discount	8.0		9.0
Total deferred debt issuance costs	$ 27.0		$ 30.0
CF Industries | Senior Notes | Senior notes 3.450% due 2023
Financing agreements
Interest rate (as a percent)	3.45%		3.45%
Debt Instruments
Effective Interest Rate (percent)	3.562%		3.562%
Principal	$ 500.0		$ 750.0
Carrying amount	$ 499.0		$ 748.0
CF Industries | Senior Notes | Senior notes 5.150% due 2034
Financing agreements
Interest rate (as a percent)	5.15%		5.15%
Debt Instruments
Effective Interest Rate (percent)	5.279%		5.279%
Principal	$ 750.0		$ 750.0
Carrying amount	$ 741.0		$ 741.0
CF Industries | Senior Notes | Senior notes 4.950% due 2043
Financing agreements
Interest rate (as a percent)	4.95%		4.95%
Debt Instruments
Effective Interest Rate (percent)	5.031%		5.031%
Principal	$ 750.0		$ 750.0
Carrying amount	$ 742.0		$ 742.0
CF Industries | Senior Notes | Senior notes 5.375% due 2044
Financing agreements
Interest rate (as a percent)	5.375%		5.375%
Debt Instruments
Effective Interest Rate (percent)	5.465%		5.465%
Principal	$ 750.0		$ 750.0
Carrying amount	$ 742.0		$ 741.0
CF Industries | Senior Notes | Senior Notes 3.400% Due 2021
Financing agreements
Interest rate (as a percent)	3.40%		3.40%
Debt Instruments
Effective Interest Rate (percent)	3.782%		3.782%
Principal	$ 0.0		$ 250.0
Carrying amount	$ 0.0		$ 249.0
CF Industries | Senior Notes | Senior Notes 4.500% Due 2026
Financing agreements
Interest rate (as a percent)	4.50%		4.50%
Debt Instruments
Effective Interest Rate (percent)	4.759%		4.759%
Principal	$ 750.0		$ 750.0
Carrying amount	$ 741.0		$ 740.0

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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