Financing Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Instruments
Principal Outstanding	$ 3,250.0	$ 3,250.0
Carrying amount	3,216.0	3,215.0
Long-term debt	3,216.0	3,215.0
CF Industries
Debt Instruments
Unamortized debt discount	5.0	5.0
Total deferred debt issuance costs	$ 29.0	$ 30.0
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)	5.293%	5.293%
Principal Outstanding	$ 750.0	$ 750.0
Carrying amount	$ 743.0	$ 743.0
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)	5.04%	5.04%
Principal Outstanding	$ 750.0	$ 750.0
Carrying amount	$ 743.0	$ 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)	5.478%	5.478%
Principal Outstanding	$ 750.0	$ 750.0
Carrying amount	$ 741.0	$ 741.0
CF Industries | Senior Notes | Senior Notes 5.300 Percent Due 2035
Financing agreements
Interest rate (as a percent)	5.30%	5.30%
Debt Instruments
Effective Interest Rate (percent)	5.444%	5.444%
Principal Outstanding	$ 1,000.0	$ 1,000.0
Carrying amount	$ 989.0	$ 989.0