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Affiliate Transactions (Details) (Cleco Power [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]    
Accounts receivable - affiliate $ 10,434us-gaap_DueFromRelatedPartiesCurrent $ 23,621us-gaap_DueFromRelatedPartiesCurrent
Accounts payable - affiliate 8,070us-gaap_DueToRelatedPartiesCurrent 7,760us-gaap_DueToRelatedPartiesCurrent
Cleco Corporation [Member]
   
Related Party Transaction [Line Items]    
Accounts receivable - affiliate 7,695us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember
22,994us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember
Accounts payable - affiliate 813us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember
525us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember
Support Group [Member]
   
Related Party Transaction [Line Items]    
Accounts receivable - affiliate 2,641us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
626us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Accounts payable - affiliate 7,168us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
7,235us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Others [Member]
   
Related Party Transaction [Line Items]    
Accounts receivable - affiliate 98us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cnl_OthersMember
1us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cnl_OthersMember
Accounts payable - affiliate $ 89us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cnl_OthersMember
$ 0us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cnl_OthersMember