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Shareholders' Equity (Details) - USD ($)								3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 13, 2019	Jun. 28, 2019	Jun. 14, 2019	Mar. 29, 2019	Mar. 22, 2019	Mar. 15, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Nov. 10, 2017
Class of Stock [Line Items]
Dividends per common share (in dollars per share)		$ 0.34		$ 0.34				$ 0.34	$ 0.33	$ 1.02	$ 0.99
Dividends paid per common share (in dollars per share)	$ 0.34		$ 0.34		$ 0.34
Dividends declared and paid, preference shares								$ 9,189,000	$ 9,708,000	$ 27,567,000	$ 20,899,000
Dividends declared and paid, common shares										$ 44,500,000	$ 39,600,000
Common Shares
Class of Stock [Line Items]
Dividends per common share (in dollars per share)							$ 0.34
Share repurchase program, authorized amount												$ 500,000,000.0
Share repurchase program, shares repurchased (in shares)										0
Share repurchase program, remaining authorized aggregate amount	$ 500,000,000.0							$ 500,000,000.0		$ 500,000,000.0
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		$ 1.52
Liquidation preference quarterly (in dollars per share)	0.38							0.38		$ 0.38
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		$ 1.34375
Liquidation preference quarterly (in dollars per share)	0.3359375							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		$ 1,437.50
Liquidation preference quarterly (in dollars per share)	359.375							359.375		359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)	1.4375							1.4375		1.4375
Liquidation preference quarterly (in dollars per share)	$ 0.359375							$ 0.359375		$ 0.359375
TMR Group Entities
Class of Stock [Line Items]
Common shares issued by RenaissanceRe to Tokio (in shares)						1,739,071

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