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Acquisition of Tokio Millennium Re (Supplemental Pro Forma Information) (Details) - TMR Group Entities - 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	$ 930,825	$ 3,437,674	$ 2,478,934
Net income available to RenaissanceRe common shareholders	$ 36,698	$ 59,174	$ 734,946	$ 309,715

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-Publisher FASB
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