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Commitments and Contingencies (Details Textuals) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments And Contingencies [Line Items]      
Recognized Gross losses from catastrophic events $ 28.8hcc_RecognizedGrossLossesFromCatastrophicEvents $ 56.6hcc_RecognizedGrossLossesFromCatastrophicEvents $ 84.8hcc_RecognizedGrossLossesFromCatastrophicEvents
Pretax cat loss after reinsurance 26.4hcc_PretaxLossAfterReinsurance 52.0hcc_PretaxLossAfterReinsurance 52.8hcc_PretaxLossAfterReinsurance
Operating Leases, Rent Expense 16.7us-gaap_LeaseAndRentalExpense 15.7us-gaap_LeaseAndRentalExpense 16.0us-gaap_LeaseAndRentalExpense
Terrorism Insurance Deductible 151.2hcc_TerrorismInsuranceDeductible    
Federal Reimbursement Percentage For Terrorism Losses 85.00%hcc_FederalReimbursementPercentageForTerrorismLosses    
Longest Indemnification Expiration Date 2025    
Terrorism Insurance Minimum Loss Coverage $ 100.0hcc_Terrorismriskinsuranceprogramannualaggregateindustrylossminimuminorderforlosstobecoveredminimum