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Acquisition of Tokio Millennium Re (Supplemental Pro Forma Information) (Details) - TMR Group Entities - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Total revenues	$ 1,238,380	$ 822,840	$ 2,386,526	$ 1,548,109
Net income available to RenaissanceRe common shareholders	$ 367,854	$ 222,936	$ 698,248	$ 250,541

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
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-Section 50
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