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Shareholders' Equity (Details) - USD ($)				1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 13, 2020	Mar. 22, 2019	Feb. 29, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 26, 2020	Dec. 31, 2019	Nov. 10, 2017
Class of Stock [Line Items]
Dividends per common share (in dollars per share)					$ 0.35	$ 0.34
Dividends paid per common share (in dollars per share)	$ 0.35
Dividends declared and paid, preference shares					$ 9,056,000	$ 9,189,000
Dividends declared and paid, common shares					$ 15,400,000	$ 14,500,000
Preference shares, shares outstanding (In shares)	11,010,000				11,010,000			16,010,000
Common Shares
Class of Stock [Line Items]
Dividends per common share (in dollars per share)		$ 0.35
Share repurchase program, authorized amount									$ 500,000,000.0
Share repurchase program, shares repurchased (in shares)					406,000
Repurchase of shares					$ (62,600,000)
Share repurchase program, price per share (in dollars per share)					$ 154.36
Share repurchase program, remaining authorized aggregate amount	$ 437,400,000				$ 437,400,000
Series C Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage					6.08%
Liquidation preference per annum (in dollars per share)	$ 1.52				$ 1.52
Liquidation preference quarterly (in dollars per share)	$ 0.38				$ 0.38
Preference shares redeemed (in shares)				5,000,000
Preference shares redemption value							$ 125,000,000.0
Preference shares, shares outstanding (In shares)	0				0
Series E Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage					5.375%
Liquidation preference per annum (in dollars per share)	$ 1.34375				$ 1.34375
Liquidation preference quarterly (in dollars per share)	0.3359375				$ 0.3359375
Series F Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage					5.75%
Liquidation preference per annum (in dollars per share)	1,437.50				$ 1,437.50
Liquidation preference quarterly (in dollars per share)	359.375				359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)	1.4375				1.4375
Liquidation preference quarterly (in dollars per share)	$ 0.359375				$ 0.359375
TMR
Class of Stock [Line Items]
Common shares issued by RenaissanceRe to Tokio (in shares)			1,739,071

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