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Segment Disclosures (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment data    
Net sales $ 953.6us-gaap_SalesRevenueNet $ 1,132.6us-gaap_SalesRevenueNet
Cost of sales 537.8us-gaap_CostOfGoodsSold 689.8us-gaap_CostOfGoodsSold
Gross margin 415.8us-gaap_GrossProfit 442.8us-gaap_GrossProfit
Total other operating costs and expenses 58.3us-gaap_OperatingCostsAndExpenses 35.9us-gaap_OperatingCostsAndExpenses
Gain on sale of phosphate business 0us-gaap_GainLossOnSaleOfBusiness 747.1us-gaap_GainLossOnSaleOfBusiness
Equity in earnings of operating affiliates 9.7cf_EquityInEarningsOfOperatingAffiliates 15.8cf_EquityInEarningsOfOperatingAffiliates
Operating earnings 367.2us-gaap_OperatingIncomeLoss 1,169.8us-gaap_OperatingIncomeLoss
Operating segments | Ammonia    
Segment data    
Net sales 287.7us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
272.4us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
Cost of sales 167.8us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
148.1us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
Gross margin 119.9us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
124.3us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_AmmoniaMember
Operating segments | Granular Urea    
Segment data    
Net sales 212.2us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
216.2us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
Cost of sales 100.1us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
114.5us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
Gross margin 112.1us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
101.7us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UreaMember
Operating segments | UAN    
Segment data    
Net sales 355.7us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
399.9us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
Cost of sales 197.0us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
217.8us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
Gross margin 158.7us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
182.1us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_UANMember
Operating segments | Other    
Segment data    
Net sales 98.0us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
99.0us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
Cost of sales 72.9us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
72.8us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
Gross margin 25.1us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
26.2us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_OtherProductsMember
Operating segments | Phosphate    
Segment data    
Net sales 0us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_PhosphateSegmentMember
145.1us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_PhosphateSegmentMember
Cost of sales 0us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_PhosphateSegmentMember
136.6us-gaap_CostOfGoodsSold
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_PhosphateSegmentMember
Gross margin 0us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_PhosphateSegmentMember
8.5us-gaap_GrossProfit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cf_PhosphateSegmentMember
Operating equity method investments    
Segment data    
Equity in earnings of operating affiliates $ 9.7cf_EquityInEarningsOfOperatingAffiliates
/ us-gaap_InvestmentTypeAxis
= cf_OperatingEquityMethodInvestmentMember
$ 15.8cf_EquityInEarningsOfOperatingAffiliates
/ us-gaap_InvestmentTypeAxis
= cf_OperatingEquityMethodInvestmentMember
Operating equity method investments | Point Lisas Nitrogen Limited (PLNL)    
Segment Reporting [Abstract]    
Ownership interest (as a percent) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= cf_OperatingEquityMethodInvestmentMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= cf_PointLisasNitrogenLimitedMember