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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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