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Acquisition of Tokio Millennium Re (Financial Results) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Total revenues	$ 1,051,148	$ 629,754	$ 3,096,649	$ 1,526,944
Net income available to RenaissanceRe common shareholders	36,698	$ 32,681	678,269	$ 281,182
TMR Group Entities
Business Acquisition [Line Items]
Total revenues	313,250		730,080
Net income available to RenaissanceRe common shareholders	31,672		97,068
Corporate expenses associated with the acquisition	$ 4,000		$ 44,000

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