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Supplemental Balance Sheet Data-Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unrealized losses on derivatives	$ 48.4	$ 0.2
Financial advances	0cf_AdvanceFunds	43.0cf_AdvanceFunds
Product exchanges	0cf_ProductExchangesLiabilitiesCurrent	0.3cf_ProductExchangesLiabilitiesCurrent
Other liabilities, current	$ 48.4us-gaap_OtherLiabilitiesCurrent	$ 43.5us-gaap_OtherLiabilitiesCurrent

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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