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Noncontrolling Interests (Summary of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Redeemable Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interests | $ 3,388,319 | $ 3,071,308 |
Net income attributable to redeemable noncontrolling interests | 230,653 | 201,469 | $ 41,553
DaVinciRe Holdings Ltd. |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interests | 1,560,693 | 1,435,581 | 1,034,946
Net income attributable to redeemable noncontrolling interests | 113,671 | 127,084 | 27,638
RenaissanceRe Medici Fund Ltd. |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interests | 717,999 | 632,112 | 416,765
Net income attributable to redeemable noncontrolling interests | 55,970 | 25,759 | 13,926
Vermeer Reinsurance Ltd. |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interests | 1,109,627 | 1,003,615 | 599,989
Net income attributable to redeemable noncontrolling interests | $ 61,012 | $ 48,626 | $ (11)

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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