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Reinsurance (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Premiums Written, Net [Abstract]                      
Gross premiums written                 $ 5,932,003,000us-gaap_AssumedPremiumsWritten $ 5,569,706,000us-gaap_AssumedPremiumsWritten $ 4,718,235,000us-gaap_AssumedPremiumsWritten
Ceded                 212,119,000us-gaap_CededPremiumsWritten 173,180,000us-gaap_CededPremiumsWritten 145,375,000us-gaap_CededPremiumsWritten
Net 1,220,000,000us-gaap_PremiumsWrittenNet 1,343,000,000us-gaap_PremiumsWrittenNet 1,419,000,000us-gaap_PremiumsWrittenNet 1,738,000,000us-gaap_PremiumsWrittenNet 1,186,000,000us-gaap_PremiumsWrittenNet 1,265,000,000us-gaap_PremiumsWrittenNet 1,309,000,000us-gaap_PremiumsWrittenNet 1,636,000,000us-gaap_PremiumsWrittenNet 5,719,884,000us-gaap_PremiumsWrittenNet 5,396,526,000us-gaap_PremiumsWrittenNet 4,572,860,000us-gaap_PremiumsWrittenNet
Premiums earned                      
Assumed                 5,824,398,000pre_PremiumsEarned 5,373,866,000pre_PremiumsEarned 4,640,949,000pre_PremiumsEarned
Ceded                 215,203,000us-gaap_CededPremiumsEarned 175,656,000us-gaap_CededPremiumsEarned 155,010,000us-gaap_CededPremiumsEarned
Net 1,446,000,000us-gaap_PremiumsEarnedNet 1,557,000,000us-gaap_PremiumsEarnedNet 1,353,000,000us-gaap_PremiumsEarnedNet 1,254,000,000us-gaap_PremiumsEarnedNet 1,421,000,000us-gaap_PremiumsEarnedNet 1,421,000,000us-gaap_PremiumsEarnedNet 1,209,000,000us-gaap_PremiumsEarnedNet 1,147,000,000us-gaap_PremiumsEarnedNet 5,609,195,000us-gaap_PremiumsEarnedNet 5,198,210,000us-gaap_PremiumsEarnedNet 4,485,939,000us-gaap_PremiumsEarnedNet
Loss and Loss Expenses and Life Policy Benefits                      
Assumed                 3,503,060,000us-gaap_PolicyholderBenefitsAndClaimsIncurredGross 3,207,860,000us-gaap_PolicyholderBenefitsAndClaimsIncurredGross 2,838,117,000us-gaap_PolicyholderBenefitsAndClaimsIncurredGross
Ceded                 40,290,000us-gaap_ReinsuranceCostsAndRecoveriesNet 50,052,000us-gaap_ReinsuranceCostsAndRecoveriesNet 33,507,000us-gaap_ReinsuranceCostsAndRecoveriesNet
Net 870,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 960,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 884,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 749,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 879,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 751,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 867,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 661,000,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 3,462,770,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 3,157,808,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 2,804,610,000us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Allowance For Reinsurance Recoverable [Member]                      
Allowance for uncollectible reinsurance recoverable [Line Items]                      
Allowance for uncollectible reinsurance recoverable $ 13,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForReinsuranceRecoverableMember		       $ 15,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForReinsuranceRecoverableMember		       $ 13,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForReinsuranceRecoverableMember		 $ 15,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForReinsuranceRecoverableMember