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Acquisition of Tokio Millennium Re (Overview) (Details) - TMR - USD ($) $ in Thousands		12 Months Ended
	Mar. 22, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Total purchase price	$ 1,563,593
Corporate expenses associated with the acquisition		$ 49,700	$ 3,400

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

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