SUBSEQUENT EVENTS	9 Months Ended
Sep. 30, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	On July 5, 2017, the Company and the board of directors of Novae Group plc (“Novae”), a public limited company incorporated in England and Wales, announced that it had agreed on the terms of a recommended cash offer of 700 pence per share to be made by AXIS Capital to acquire the entire issued and to be issued share capital of Novae. On August 24, 2017, the Company and the board of directors of Novae announced that it had agreed on the terms of an increased recommended cash offer of 715 pence per share (the "Offer") to be made by AXIS Capital for the acquisition of the entire issued and to be issued share capital of Novae. The acquisition was effected by way of a Scheme of Arrangement (the “Scheme”) under the laws of the United Kingdom (“U.K.”) which requires the approval of a U.K. court and approval of a majority of Novae’s shareholders, representing at least 75% of the votes cast. The Scheme is also subject to receipt of certain regulatory approvals and other customary conditions. On August 29, 2017, Novae shareholders approved the Scheme. On October 2, 2017, AXIS Capital acquired the shares of Novae for £462.9 million (approximately $615.6 million). The results of Novae will be included in the results of the Company's insurance and reinsurance segments from this date (the "Closing date"). On October 6, 2017, AXIS Capital received clearance from all applicable regulators, including the European Commission, and commenced management control and integration of the combined businesses from this date. Novae is a diversified property and casualty (re)insurance business operating through Syndicate 2007 at Lloyd’s of London. The acquisition of Novae is expected to accelerate the growth strategy of the Company's international insurance business, and significantly scale up its capabilities to enable the Company to even better serve its clients and brokers. The Company incurred transaction related expenses including due diligence, legal, accounting, and investment banking fees and expenses, as well as integration expenses of $6 million in the three months ended September 30, 2017 related to the acquisition of Novae. In addition, the Company was contractually obligated to pay investment banking fees on the Closing date of the transaction. The Company expects substantially all of the integration costs related to the acquisition to be incurred in 2018. In addition, the Company expects to begin realizing cost savings in 2018. The Company is currently in the process of determining the fair values of the underlying assets and liabilities at the acquisition date. Given the timing of the acquisition, a preliminary allocation of purchase price is not yet complete. The Company will include amounts recognized for net assets and liabilities acquired, together with goodwill, as of the acquisition date in the Company's Annual Report on Form 10-K. California Wildfires In October 2017, Northern California was impacted by a series of devastating wildfires ("California Wildfires") which caused widespread residential and commercial property damage. Current estimated industry insured losses for this event range between $4 billion and $8 billion. Our preliminary pre-tax net loss estimate for this event is in the range of $35 million to $45 million. The Company's loss estimate is primarily based on a ground-up assessment of losses from individual contracts and treaties exposed to the affected regions, including preliminary information from clients, brokers and loss adjusters. Industry insured loss estimates, market share analyses and catastrophe modeling analyses were also taken into account where appropriate. Due to the preliminary nature of the information available to prepare these estimates, the actual net ultimate amount of losses for this event may be materially different from the current estimate.

On July 5, 2017, the Company and the board of directors of Novae Group plc (“Novae”), a public limited company incorporated in England and Wales, announced that it had agreed on the terms of a recommended cash offer of 700 pence per share to be made by AXIS Capital to acquire the entire issued and to be issued share capital of Novae.

On August 24, 2017, the Company and the board of directors of Novae announced that it had agreed on the terms of an increased recommended cash offer of 715 pence per share (the "Offer") to be made by AXIS Capital for the acquisition of the entire issued and to be issued share capital of Novae.

The acquisition was effected by way of a Scheme of Arrangement (the “Scheme”) under the laws of the United Kingdom (“U.K.”) which requires the approval of a U.K. court and approval of a majority of Novae’s shareholders, representing at least 75% of the votes cast. The Scheme is also subject to receipt of certain regulatory approvals and other customary conditions. On August 29, 2017, Novae shareholders approved the Scheme.

On October 2, 2017, AXIS Capital acquired the shares of Novae for £462.9 million (approximately $615.6 million). The results of Novae will be included in the results of the Company's insurance and reinsurance segments from this date (the "Closing date").

On October 6, 2017, AXIS Capital received clearance from all applicable regulators, including the European Commission, and commenced management control and integration of the combined businesses from this date.

Novae is a diversified property and casualty (re)insurance business operating through Syndicate 2007 at Lloyd’s of London. The acquisition of Novae is expected to accelerate the growth strategy of the Company's international insurance business, and significantly scale up its capabilities to enable the Company to even better serve its clients and brokers.

The Company incurred transaction related expenses including due diligence, legal, accounting, and investment banking fees and expenses, as well as integration expenses of $6 million in the three months ended September 30, 2017 related to the acquisition of Novae. In addition, the Company was contractually obligated to pay investment banking fees on the Closing date of the transaction. The Company expects substantially all of the integration costs related to the acquisition to be incurred in 2018. In addition, the Company expects to begin realizing cost savings in 2018.

The Company is currently in the process of determining the fair values of the underlying assets and liabilities at the acquisition date. Given the timing of the acquisition, a preliminary allocation of purchase price is not yet complete. The Company will include amounts recognized for net assets and liabilities acquired, together with goodwill, as of the acquisition date in the Company's Annual Report on Form 10-K.

California Wildfires

In October 2017, Northern California was impacted by a series of devastating wildfires ("California Wildfires") which caused widespread residential and commercial property damage. Current estimated industry insured losses for this event range between $4 billion and $8 billion.

Our preliminary pre-tax net loss estimate for this event is in the range of $35 million to $45 million. The Company's loss estimate is primarily based on a ground-up assessment of losses from individual contracts and treaties exposed to the affected regions, including preliminary information from clients, brokers and loss adjusters. Industry insured loss estimates, market share analyses and catastrophe modeling analyses were also taken into account where appropriate.

Due to the preliminary nature of the information available to prepare these estimates, the actual net ultimate amount of losses for this event may be materially different from the current estimate.