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Segment Disclosures (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Enterprise-wide data by geographic region                      
Sales by geographic region (based on destination of shipments) $ 1,216.5us-gaap_SalesRevenueNet $ 921.4us-gaap_SalesRevenueNet $ 1,472.7us-gaap_SalesRevenueNet $ 1,132.6us-gaap_SalesRevenueNet $ 1,326.3us-gaap_SalesRevenueNet $ 1,097.0us-gaap_SalesRevenueNet $ 1,714.9us-gaap_SalesRevenueNet $ 1,336.5us-gaap_SalesRevenueNet $ 4,743.2us-gaap_SalesRevenueNet $ 5,474.7us-gaap_SalesRevenueNet $ 6,104.0us-gaap_SalesRevenueNet
Property, plant and equipment net by geographic region 5,525.8us-gaap_PropertyPlantAndEquipmentNet       4,101.7us-gaap_PropertyPlantAndEquipmentNet       5,525.8us-gaap_PropertyPlantAndEquipmentNet 4,101.7us-gaap_PropertyPlantAndEquipmentNet 3,900.5us-gaap_PropertyPlantAndEquipmentNet
U.S.                      
Enterprise-wide data by geographic region                      
Sales by geographic region (based on destination of shipments)                 3,994.0us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 4,497.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 5,260.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
Property, plant and equipment net by geographic region 4,987.0us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		       3,528.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		       4,987.0us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 3,528.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 3,327.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Canada                      
Enterprise-wide data by geographic region                      
Sales by geographic region (based on destination of shipments)                 543.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 508.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 446.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
Property, plant and equipment net by geographic region 538.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA		       572.9us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA		       538.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 572.9us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 572.7us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CA
Export                      
Enterprise-wide data by geographic region                      
Sales by geographic region (based on destination of shipments)                 $ 205.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= cf_AllRegionsOutsideOfUSAndCanadaMember		 $ 468.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= cf_AllRegionsOutsideOfUSAndCanadaMember		 $ 396.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= cf_AllRegionsOutsideOfUSAndCanadaMember