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Goodwill and Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Goodwill  
Goodwill, Beginning Balance $ 2,092.8us-gaap_Goodwill
Effect of exchange rate changes (2.4)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance 2,090.4us-gaap_Goodwill
Ammonia  
Goodwill  
Goodwill, Beginning Balance 578.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
Effect of exchange rate changes (0.7)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
Goodwill, Ending Balance 578.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
Granular Urea  
Goodwill  
Goodwill, Beginning Balance 829.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
Effect of exchange rate changes (1.0)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
Goodwill, Ending Balance 828.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
UAN  
Goodwill  
Goodwill, Beginning Balance 577.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
Effect of exchange rate changes (0.7)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
Goodwill, Ending Balance 576.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
Other  
Goodwill  
Goodwill, Beginning Balance 107.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
Effect of exchange rate changes 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
Goodwill, Ending Balance $ 107.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember