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Acquisition of Tokio Millennium Re (Financial Results) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Total revenues		$ 1,238,380		$ 479,204	$ 2,045,501	$ 897,190
Net income available to RenaissanceRe common shareholders		367,854		$ 191,788	641,571	$ 248,501
TMR Group Entities
Business Acquisition [Line Items]
Total revenues		416,830			416,830
Net income available to RenaissanceRe common shareholders		90,915			65,396
Corporate expenses associated with the acquisition	$ 40,003	$ 14,488	$ 25,500		$ 40,000

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