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MANAGEMENT AGREEMENT AND RELATED PARTY TRANSACTIONS (Details 4) (Affiliates, USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Successor Company    
Investments in affiliates    
Estimated Fair Value 1,400.0us-gaap_InvestmentOwnedAtFairValue
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Investment in affiliates, number of issuers 18kfn_InvestmentOwnedNumberOfIssuers
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Successor Company | Corporate loans, at estimated fair value    
Investments in affiliates    
Estimated Fair Value 1,400.0us-gaap_InvestmentOwnedAtFairValue
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/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Successor Company | Equity Investments, at Estimated Fair Value    
Investments in affiliates    
Estimated Fair Value 12.0us-gaap_InvestmentOwnedAtFairValue
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= us-gaap_EquitySecuritiesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Successor Company | Joint ventures and partnerships    
Investments in affiliates    
Estimated Fair Value 623.1us-gaap_InvestmentOwnedAtFairValue
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= kfn_JointVenturesAndPartnershipsMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Successor Company | Affiliated investments | Percent to total investment in corporate loans, debt securities and other investments    
Investments in affiliates    
Investment in affiliates as a percentage of total investment (in percentage) 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
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/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Predecessor Company    
Investments in affiliates    
Estimated Fair Value   1,700.0us-gaap_InvestmentOwnedAtFairValue
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Investment in affiliates, number of issuers   19kfn_InvestmentOwnedNumberOfIssuers
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor Company | Corporate loans    
Investments in affiliates    
Estimated Fair Value   1,600.0us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_LoansReceivableMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor Company | Corporate Debt Securities    
Investments in affiliates    
Estimated Fair Value   9.5us-gaap_InvestmentOwnedAtFairValue
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= us-gaap_CorporateDebtSecuritiesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor Company | Equity Investments, at Estimated Fair Value    
Investments in affiliates    
Estimated Fair Value   13.6us-gaap_InvestmentOwnedAtFairValue
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= us-gaap_EquitySecuritiesMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor Company | Joint ventures and partnerships    
Investments in affiliates    
Estimated Fair Value   618.6us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_InvestmentTypeAxis
= kfn_JointVenturesAndPartnershipsMember
/ dei_LegalEntityAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor Company | Affiliated investments | Percent to total investment in corporate loans, debt securities and other investments    
Investments in affiliates    
Investment in affiliates as a percentage of total investment (in percentage)   20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= kfn_AffiliatedInvestmentsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
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= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember