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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b false 6 Decrease (increase) in unearned premiums 2 pre_ChangeInUnearnedPremiums pre false credit duration Change during the period in the unearned gross premiums written (direct and assumed) and ceded premiums written. false false false false false false false false false false false terselabel false 1 false true false false 325802000 325802 false false false 2 false true false false 199144000 199144 false false false 3 false true false false -312687000 -312687 false false false 4 false true false false -260994000 -260994 false false false xbrli:monetaryItemType monetary Change during the period in the unearned gross premiums written (direct and assumed) and ceded premiums written. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b true 8 Net investment income 2 pre_NetInvestmentIncomeExcludingDerivatives pre false credit duration Net investment income includes: interest and amortization on fixed maturities investments, dividends from equities, net... false false false false false false false false false false false terselabel false 1 false true false false 164402000 164402 false false false 2 false true false false 145350000 145350 false false false 3 false true false false 511978000 511978 false false false 4 false true false false 414071000 414071 false false false xbrli:monetaryItemType monetary Net investment income includes: interest and amortization on fixed maturities investments, dividends from equities, net investment income on funds held by reinsured companies, funds held - directly managed, and short term investments, and is shown net of investment related expenses. It does not include realized or unrealized gains or losses on investments. No authoritative reference available. false 9 Net realized and unrealized investment gains 2 us-gaap_GainLossOnInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 293164000 293164 false false false 2 false true false false 330226000 330226 false false false 3 false true false false 484683000 484683 false false false 4 false true false false 566643000 566643 false false false xbrli:monetaryItemType monetary This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or loss which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments of the subject investments. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 false 12 Total revenues 2 us-gaap_Revenues us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1774343000 1774343 false false false 2 false true false false 1574652000 1574652 false false false 3 false true false false 4573876000 4573876 false false false 4 false true false false 3868738000 3868738 false false false xbrli:monetaryItemType monetary Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 13 Expenses 1 us-gaap_BenefitsLossesAndExpensesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 14 Losses and loss expenses and life policy benefits 2 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 748879000 748879 false false false 2 false true false false 574228000 574228 false false false 3 false true false false 2465847000 2465847 false false false 4 false true false false 1552025000 1552025 false false false xbrli:monetaryItemType monetary Provision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts assumed and ceded. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 false 15 Acquisition costs 2 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 261668000 261668 false false false 2 false true false false 232475000 232475 false false false 3 false true false false 725919000 725919 false false false 4 false true false false 614133000 614133 false false false xbrli:monetaryItemType monetary Amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 22, 23, 24, 25, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16, 18 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 95-1 -Paragraph 19, 20, 21, 22, 23 false 16 Other operating expenses 2 us-gaap_OtherExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 118221000 118221 false false false 2 false true false false 102224000 102224 false false false 3 false true false false 406506000 406506 false false false 4 false true false false 284286000 284286 false false false xbrli:monetaryItemType monetary This element represents a sum total of expenses not separately reflected on the income statement for the period. No authoritative reference available. false 17 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 12297000 12297 false false false 2 false true false false 6161000 6161 false false false 3 false true false false 32232000 32232 false false false 4 false true false false 21643000 21643 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 false 18 Amortization of intangible assets 2 us-gaap_AmortizationOfIntangibleAssets us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 10003000 10003 false false false 2 false true false false 0 0 false false false 3 false true false false 22639000 22639 false false false 4 false true false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) false 19 Net foreign exchange losses 2 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 27074000 27074 false false false 2 false true false false 961000 961 false false false 3 false true false false 12426000 12426 false false false 4 false true false false 5511000 5511 false false false xbrli:monetaryItemType monetary The aggregate foreign currency transaction gain or loss (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains or losses may be disclosed as dealer gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 false 20 Total expenses 2 us-gaap_BenefitsLossesAndExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1178142000 1178142 false false false 2 false true false false 916049000 916049 false false false 3 false true false false 3665569000 3665569 false false false 4 false true false false 2477598000 2477598 false false false xbrli:monetaryItemType monetary The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 true 22 Income tax expense 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 72576000 72576 false false false 2 false true false false 93433000 93433 false false false 3 false true false false 117892000 117892 false false false 4 false true false false 210198000 210198 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b false 23 Interest in earnings of equity investments 1 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1312000 1312 false false false 2 false true false false 1535000 1535 false false false 3 false true false false 5103000 5103 false false false 4 false true false false 1552000 1552 false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b false 24 Net income 1 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 524937000 524937 false false false 2 false true false false 566705000 566705 false false false 3 false true false false 795518000 795518 false false false 4 false true false false 1182494000 1182494 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l false 26 Net income available to common shareholders 1 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 516306000 516306 false false false 2 false true false false 558074000 558074 false false false 3 false true false false 769624000 769624 false false false 4 false true false false 1156600000 1156600 false false false xbrli:monetaryItemType monetary Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 9 true 27 Comprehensive income 1 us-gaap_ComprehensiveIncomeNetOfTaxAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 28 Net income 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 524937000 524937 false false false 2 false true false false 566705000 566705 false false false 3 false true false false 795518000 795518 false false false 4 false true false false 1182494000 1182494 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. 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If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17 false 30 Change in other accumulated comprehensive (loss) income, net of tax 2 pre_ChangeInOtherAccumulatedComprehensiveIncomeLossNetOfTax pre false credit duration This element represents the change in other comprehensive income (loss), net of tax, for the period attributable to the... false false false false false false false false false false false terselabel false 1 false true false false -1260000 -1260 false false false 2 false true false false -852000 -852 false false false 3 false true false false -6514000 -6514 false false false 4 false true false false 677000 677 false false false xbrli:monetaryItemType monetary This element represents the change in other comprehensive income (loss), net of tax, for the period attributable to the parent entity. Includes gains (losses) on qualifying hedges, minimum pension liability, other comprehensive income on equity investments but excludes currency translation adjustment. No authoritative reference available. false 31 Comprehensive income 2 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 631249000 631249 false false false 2 true true false false 605974000 605974 false false false 3 true true false false 722498000 722498 false false false 4 true true false false 1231014000 1231014 false false false xbrli:monetaryItemType monetary The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 8, 9, 10, 11, 12, 13, 14 true 32 Per share data 1 us-gaap_EarningsPerShareAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 33 Basic net income 2 us-gaap_EarningsPerShareBasic us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 true true false false 6.86 6.86 false false false 2 true true false false 9.60 9.60 false false false 3 true true false false 9.86 9.86 false false false 4 true true false false 20.26 20.26 false false false us-types:perShareItemType decimal The amount of net income or loss for the period per each share of common stock outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 false 34 Diluted net income 2 us-gaap_EarningsPerShareDiluted us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 true true false false 6.76 6.76 false false false 2 true true false false 9.44 9.44 false false false 3 true true false false 9.68 9.68 false false false 4 true true false false 19.95 19.95 false false false us-types:perShareItemType decimal The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 false 35 Weighted average number of common shares outstanding 2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 75238329 75238329 false false false 2 false true false false 58118175 58118175 false false false 3 false true false false 78076561 78076561 false false false 4 false true false false 57085619 57085619 false false false xbrli:sharesItemType shares Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 36 Weighted average number of common and common share equivalents outstanding 2 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 76428460 76428460 false false false 2 false true false false 59128488 59128488 false false false 3 false true false false 79494247 79494247 false false false 4 false true false false 57978485 57978485 false false false xbrli:sharesItemType shares The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 37 Dividends declared per common share 2 us-gaap_CommonStockDividendsPerShareDeclared us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 true true false false 0.50 0.50 false false false 2 true true false false 0.47 0.47 false false false 3 true true false false 1.50 1.50 false false false 4 true true false false 1.41 1.41 false false false us-types:perShareItemType decimal Aggregate dividends declared during the period for each share of common stock outstanding. 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