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Commitments, Contingencies And Guarantees (Commitments And Contingencies) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Commitments And Guarantee Obligations [Line Items]  
2015 $ 3,232.6luk_CommitmentsAndGuaranteesExpectedToBeDueCurrent
2016 1,746.5luk_CommitmentsAndGuaranteesExpectedToBeDueInTwoYears
2017 and 2018 315.9luk_CommitmentsAndGuaranteesExpectedToBeDueInThreeAndFourYears
2019 and 2020 48.3luk_CommitmentsAndGuaranteesExpectedToBeDueInFiveAndSixYears
2021 and Later 193.7luk_CommitmentsAndGuaranteesExpectedToBeDueThereafter
Maximum Payout 5,537.0us-gaap_GuaranteeObligationsMaximumExposure
Equity Commitments [Member]  
Commitments And Guarantee Obligations [Line Items]  
2016 9.2luk_CommitmentsAndGuaranteesExpectedToBeDueInTwoYears
/ us-gaap_FinancialInstrumentAxis
= luk_EquityCommitmentsMember		 [1]
2017 and 2018 0.8luk_CommitmentsAndGuaranteesExpectedToBeDueInThreeAndFourYears
/ us-gaap_FinancialInstrumentAxis
= luk_EquityCommitmentsMember		 [1]
2021 and Later 171.8luk_CommitmentsAndGuaranteesExpectedToBeDueThereafter
/ us-gaap_FinancialInstrumentAxis
= luk_EquityCommitmentsMember		 [1]
Maximum Payout 181.8us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_FinancialInstrumentAxis
= luk_EquityCommitmentsMember		 [1]
Loan Commitments [Member]  
Commitments And Guarantee Obligations [Line Items]  
2015 44.6luk_CommitmentsAndGuaranteesExpectedToBeDueCurrent
/ us-gaap_FinancialInstrumentAxis
= luk_LoanCommitmentsMember		 [1]
2016 421.7luk_CommitmentsAndGuaranteesExpectedToBeDueInTwoYears
/ us-gaap_FinancialInstrumentAxis
= luk_LoanCommitmentsMember		 [1]
2017 and 2018 188.9luk_CommitmentsAndGuaranteesExpectedToBeDueInThreeAndFourYears
/ us-gaap_FinancialInstrumentAxis
= luk_LoanCommitmentsMember		 [1]
2019 and 2020 48.3luk_CommitmentsAndGuaranteesExpectedToBeDueInFiveAndSixYears
/ us-gaap_FinancialInstrumentAxis
= luk_LoanCommitmentsMember		 [1]
Maximum Payout 703.5us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_FinancialInstrumentAxis
= luk_LoanCommitmentsMember		 [1]
Mortgage-Related And Other Purchase Commitments [Member]  
Commitments And Guarantee Obligations [Line Items]  
2015 1,123.1luk_CommitmentsAndGuaranteesExpectedToBeDueCurrent
/ us-gaap_FinancialInstrumentAxis
= luk_MortgageRelatedCommitmentsMember
2016 1,315.6luk_CommitmentsAndGuaranteesExpectedToBeDueInTwoYears
/ us-gaap_FinancialInstrumentAxis
= luk_MortgageRelatedCommitmentsMember
2017 and 2018 126.2luk_CommitmentsAndGuaranteesExpectedToBeDueInThreeAndFourYears
/ us-gaap_FinancialInstrumentAxis
= luk_MortgageRelatedCommitmentsMember
Maximum Payout 2,564.9us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_FinancialInstrumentAxis
= luk_MortgageRelatedCommitmentsMember
Forward Starting Reverse Repos And Repos [Member]  
Commitments And Guarantee Obligations [Line Items]  
2015 2,034.9luk_CommitmentsAndGuaranteesExpectedToBeDueCurrent
/ us-gaap_FinancialInstrumentAxis
= luk_ForwardStartingReverseReposAndReposMember
Maximum Payout 2,034.9us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_FinancialInstrumentAxis
= luk_ForwardStartingReverseReposAndReposMember
Other Unfunded Commitments [Member]  
Commitments And Guarantee Obligations [Line Items]  
2015 30.0luk_CommitmentsAndGuaranteesExpectedToBeDueCurrent
/ us-gaap_FinancialInstrumentAxis
= luk_OtherUnfundedCommitmentsMember		 [1]
2021 and Later 21.9luk_CommitmentsAndGuaranteesExpectedToBeDueThereafter
/ us-gaap_FinancialInstrumentAxis
= luk_OtherUnfundedCommitmentsMember		 [1]
Maximum Payout $ 51.9us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_FinancialInstrumentAxis
= luk_OtherUnfundedCommitmentsMember		 [1]
[1] Equity, loan and other unfunded commitments are presented by contractual maturity date. The amounts are however available on demand.