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Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 16, 2019, Aspen Bermuda entered into a number of standard fixed for floating interest rate swaps with a total notional amount of $3,318.0 million due to mature between January 18, 2021 and January 18, 2034. Aspen Bermuda entered into the swaps in the ordinary course of its investment activities to partially mitigate any negative impact of rises in interest rates on the market value of our fixed income portfolio.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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