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Acquisition of Tokio Millennium Re (Overview) (Details) - TMR Group Entities - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 22, 2019
Business Acquisition [Line Items]
Net purchase price		$ 1,563,593
Corporate expenses associated with the acquisition	$ 25,500
Transaction-related costs
Business Acquisition [Line Items]
Corporate expenses associated with the acquisition	12,900
Integration-related costs
Business Acquisition [Line Items]
Corporate expenses associated with the acquisition	5,900
Compensation-related costs
Business Acquisition [Line Items]
Corporate expenses associated with the acquisition	$ 6,700

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