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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	6 Months Ended
	Jul. 27, 2015	Jun. 30, 2015	May. 04, 2015
Common Shares
Subsequent Event [Line Items]
Common shares repurchased during period, Number of shares		83
Common shares repurchased during period, Aggregate amount		$ 8,400,000
Common shares repurchased during period, Average cost per share		$ 101.99
Common Shares | Subsequent Event
Subsequent Event [Line Items]
Common shares repurchased during period, Number of shares	67
Common shares repurchased during period, Aggregate amount	$ 6,900,000
Common shares repurchased during period, Average cost per share	$ 102.70
DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Related party debt to be repaid			$ 100,000,000
DaVinciRe Holdings Ltd. | 4.750% Senior Notes Due May 1, 2025
Subsequent Event [Line Items]
Debt Instrument, face amount			$ 150,000,000
Senior notes interest rate			4.75%

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Face (par) amount of debt instrument at time of issuance.

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