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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Total investments | $ 9,642,178 | $ 9,316,968 |  |
Cash and cash equivalents | 581,576 | 421,157 | $ 493,330 | $ 506,885
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,521,266 | 987,323 |  |
Prepaid reinsurance premiums | 635,756 | 441,260 |  |
Reinsurance recoverable | 1,588,304 | 279,564 | 240,769 |
Accrued investment income | 38,366 | 38,076 |  |
Deferred acquisition costs | 434,914 | 335,325 |  |
Receivable for investments sold | 193,758 | 105,841 |  |
Other assets | 164,019 | 175,382 |  |
Goodwill and other intangible assets | 244,787 | 251,186 |  |
Total assets | 15,044,924 | 12,352,082 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 5,192,313 | 2,848,294 | 2,861,099 |
Unearned premiums | 1,713,069 | 1,231,573 |  |
Debt | 989,245 | 948,663 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 1,034,454 | 673,983 |  |
Payable for investments purchased | 377,543 | 305,714 |  |
Other liabilities | 301,559 | 301,684 |  |
Total liabilities | 9,608,183 | 6,309,911 |  |
Redeemable noncontrolling interests | 1,033,729 | 1,175,594 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,403,012 | 4,866,577 | 4,807,790 |
Total liabilities, noncontrolling interests and shareholders’ equity | 15,044,924 | 12,352,082 |  |
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 130,802 | 119,163 |  |
Cash and cash equivalents | 226 | 162 | 857 | 5,908
Investments in subsidiaries | 37,834 | 34,761 |  |
Due from subsidiaries and affiliates | 91,891 | 91,892 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 197 | 289 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 13,472 | 2 |  |
Other assets | 36,825 | 37,204 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 311,247 | 283,473 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 0 | 0 |  |
Amounts due to subsidiaries and affiliates | 55 | 42 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 17,938 | 0 |  |
Other liabilities | 927 | 10,544 |  |
Total liabilities | 18,920 | 10,586 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 292,327 | 272,887 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 311,247 | 283,473 |  |
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 0 | 267,556 |  |
Cash and cash equivalents | 10 | 6,671 | 1,745 | 7,103
Investments in subsidiaries | 0 | 843,089 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 0 | 551 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 0 | 99 |  |
Other assets | 0 | 4,689 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 10 | 1,122,655 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 0 | 255,352 |  |
Amounts due to subsidiaries and affiliates | 0 | 123 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 0 | 0 |  |
Total liabilities | 0 | 255,475 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 10 | 867,180 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 10 | 1,122,655 |  |
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 35,098 | 45,027 |  |
Cash and cash equivalents | 7,663 | 9,397 | 2,530 | 677
Investments in subsidiaries | 1,152,247 | 1,165,413 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 59 | 106 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 101 | 45 |  |
Other assets | 435,815 | 127,572 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 1,630,983 | 1,347,560 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 841,592 | 545,889 |  |
Amounts due to subsidiaries and affiliates | 97,365 | 96,061 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 9,926 | 13,350 |  |
Total liabilities | 948,883 | 655,300 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 682,100 | 692,260 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 1,630,983 | 1,347,560 |  |
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Total investments | 193,268 | 387,274 |  |
Cash and cash equivalents | 12,370 | 7,067 | 10,147 | 10,185
Investments in subsidiaries | 3,968,721 | 4,074,769 |  |
Due from subsidiaries and affiliates | 107,746 | 7,413 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 125 | 105 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 9,042 | 136 |  |
Other assets | 429,594 | 410,757 |  |
Goodwill and other intangible assets | 126,246 | 130,407 |  |
Total assets | 4,847,112 | 5,017,928 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 417,000 | 117,000 |  |
Amounts due to subsidiaries and affiliates | 2,950 | 14,644 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 8,989 | 0 |  |
Other liabilities | 15,161 | 19,707 |  |
Total liabilities | 444,100 | 151,351 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,403,012 | 4,866,577 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 4,847,112 | 5,017,928 |  |
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Assets |  |  |  |
Total investments | 9,283,010 | 8,497,948 |  |
Cash and cash equivalents | 561,307 | 397,860 | $ 478,051 | $ 483,012
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,521,266 | 987,323 |  |
Prepaid reinsurance premiums | 635,756 | 441,260 |  |
Reinsurance recoverable | 1,588,304 | 279,564 |  |
Accrued investment income | 37,985 | 37,025 |  |
Deferred acquisition costs | 434,914 | 335,325 |  |
Receivable for investments sold | 171,143 | 105,559 |  |
Other assets | 98,023 | 118,098 |  |
Goodwill and other intangible assets | 118,541 | 120,779 |  |
Total assets | 14,450,249 | 11,320,741 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 5,192,313 | 2,848,294 |  |
Unearned premiums | 1,713,069 | 1,231,573 |  |
Debt | 147,653 | 147,422 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 1,034,454 | 673,983 |  |
Payable for investments purchased | 350,616 | 305,714 |  |
Other liabilities | 282,647 | 270,610 |  |
Total liabilities | 8,720,752 | 5,477,596 |  |
Redeemable noncontrolling interests | 1,033,729 | 1,175,594 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,695,768 | 4,667,551 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 14,450,249 | 11,320,741 |  |
Consolidating Adjustments |  |  |  |
Assets |  |  |  |
Total investments | 0 | 0 |  |
Cash and cash equivalents | 0 | 0 |  |
Investments in subsidiaries | (5,158,802) | (6,118,032) |  |
Due from subsidiaries and affiliates | (199,637) | (99,305) |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 0 | 0 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 0 | 0 |  |
Other assets | (836,238) | (522,938) |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | (6,194,677) | (6,740,275) |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | (417,000) | (117,000) |  |
Amounts due to subsidiaries and affiliates | (100,370) | (110,870) |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | (7,102) | (12,527) |  |
Total liabilities | (524,472) | (240,397) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | (5,670,205) | (6,499,878) |  |
Total liabilities, noncontrolling interests and shareholders’ equity | $ (6,194,677) | $ (6,740,275) |  |

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- Definition Amount payable to broker-dealers and clearing organizations, including, but not limited to, securities failed-to-receive, certain deposits received for securities loaned, open transactions, and floor-brokerage payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35710130&loc=d3e41645-110958 + Details
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- Definition The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
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- Definition Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35710130&loc=d3e41645-110958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(3),(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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