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Financing Agreements - Narrative (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025	Sep. 04, 2025
Letter of Credit \| Letter of Credit
Financing agreements
Maximum borrowing capacity	$ 425,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	335,000,000
CF Industries \| Letter of Credit \| Revolving Credit Facility
Financing agreements
Maximum borrowing capacity			$ 750,000,000
CF Industries \| Letter of Credit \| Letter of Credit
Financing agreements
Maximum borrowing capacity			125,000,000
CF Industries \| Letter of Credit \| Swingline loan
Financing agreements
Maximum borrowing capacity			$ 75,000,000
CF Industries \| Credit Agreement
Financing agreements
Available credit	750,000,000
Outstanding letters of credit	0
Long-term Line of Credit	$ 0	$ 0