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Subsequent Events (Details) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 01, 2022	Feb. 02, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Feb. 04, 2022	Jul. 28, 2021
Common shares
Subsequent Event [Line Items]
Share repurchase program, shares repurchased (in shares)				6,578,133
Repurchase of shares				$ 1,000,000,000
Share repurchase program, price per share (in dollars per share)				$ 156.78
Share repurchase program, authorized aggregate amount							$ 500,000,000
Third-Party Investors
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests			$ 156,700,000
Subsequent Event | DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Redeemable noncontrolling interest, ownership percentage	30.90%
Subsequent Event | Common shares
Subsequent Event [Line Items]
Share repurchase program, shares repurchased (in shares)		462,350
Repurchase of shares		$ 76,100,000
Share repurchase program, price per share (in dollars per share)		$ 164.52
Share repurchase program, authorized aggregate amount						$ 500,000,000
Subsequent Event | Third-Party Investors
Subsequent Event [Line Items]
Redemption of shares from redeemable noncontrolling interests	$ 87,400,000
Subsequent Event | DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, increase from sale of parent equity interest	102,900,000
DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed			250,000,000
Redemption of shares from redeemable noncontrolling interests				$ 157,864,000	$ (1,450,000)
DaVinciRe Holdings Ltd. | Third-Party Investors
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed			150,900,000
DaVinciRe Holdings Ltd. | RenaissanceRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed			$ 99,100,000
DaVinciRe Holdings Ltd. | Investor | Other liabilities
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed				$ 387,800,000
DaVinciRe Holdings Ltd. | Subsequent Event
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed	500,000,000
DaVinciRe Holdings Ltd. | Subsequent Event | Third-Party Investors
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed	284,800,000
DaVinciRe Holdings Ltd. | Subsequent Event | RenaissanceRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed	$ 215,200,000
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Primary Beneficiary
Subsequent Event [Line Items]
Variable interest entity, ownership percentage				13.70%	13.80%
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity				$ 32,300,000	$ 98,100,000
Upsilon RFO Re Ltd. | Investor | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity				544,600,000	835,900,000
Upsilon RFO Re Ltd. | Investor | Primary Beneficiary | Preference shares | Other liabilities
Subsequent Event [Line Items]
Investment in variable interest entity				79,000,000
Upsilon RFO Re Ltd. | Subsequent Event | RenaissanceRe Holdings Ltd. | Primary Beneficiary
Subsequent Event [Line Items]
Variable interest entity, ownership percentage	13.60%
Upsilon RFO Re Ltd. | Subsequent Event | RenaissanceRe Holdings Ltd. | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity	$ 10,000,000
Upsilon RFO Re Ltd. | Subsequent Event | Investor | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity	$ 89,000,000
Medici
Subsequent Event [Line Items]
Noncontrolling interest, value subscribed				201,520,000	137,303,000
Redemption of shares from redeemable noncontrolling interests				64,191,000	$ 107,386,000
Medici | Investor | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity				$ 73,700,000
Medici | Subsequent Event | RenaissanceRe Holdings Ltd. | Primary Beneficiary
Subsequent Event [Line Items]
Variable interest entity, ownership percentage	13.70%
Medici | Subsequent Event | RenaissanceRe Holdings Ltd. | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity	$ 0
Medici | Subsequent Event | Investor | Primary Beneficiary | Preference shares
Subsequent Event [Line Items]
Investment in variable interest entity	$ 73,700,000

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