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Noncontrolling Interests (Summary of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	$ 3,554,053	$ 3,388,319
Net income (loss) attributable to redeemable noncontrolling interests	(63,285)	230,653	$ 201,469
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	1,499,451	1,560,693	1,435,581
Net income (loss) attributable to redeemable noncontrolling interests	(102,932)	113,671	127,084
Medici
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	856,820	717,999	632,112
Net income (loss) attributable to redeemable noncontrolling interests	1,492	55,970	25,759
Vermeer Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	1,197,782	1,109,627	1,003,615
Net income (loss) attributable to redeemable noncontrolling interests	$ 38,155	$ 61,012	$ 48,626

X

- Definition

Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.19)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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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)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
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-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
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-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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