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DEBT AND FINANCING ARRANGEMENTS - Senior and notes payable, Dekania Notes (Details) - USD ($)			3 Months Ended	12 Months Ended
	Sep. 29, 2004	Jun. 30, 2004	Sep. 29, 2004	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 10, 2019	Jun. 19, 2019	Apr. 01, 2019	Dec. 06, 2017	Mar. 13, 2014	Mar. 23, 2010
Debt Instrument [Line Items]
Net proceeds from issuance of debt				$ 717,509,000	$ 0	$ 346,362,000
Dekania Notes, 15 Million
Debt Instrument [Line Items]
Aggregate Principal		$ 15,000,000
Dekania Notes, 11 Million
Debt Instrument [Line Items]
Aggregate Principal		$ 11,000,000
Dekania Notes, 10 Million
Debt Instrument [Line Items]
Aggregate Principal	$ 10,000,000		$ 10,000,000
Dekania Notes
Debt Instrument [Line Items]
Interest expense					2,000,000	2,000,000
Net proceeds from issuance of debt			$ 35,000,000
Senior Notes
Debt Instrument [Line Items]
Interest expense				67,000,000	$ 64,000,000	$ 51,000,000
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes
Debt Instrument [Line Items]
Interest rate									2.65%			5.875%
Senior Notes | Senior Notes Due 2045 Axis Specialty Finance PLC 2014
Debt Instrument [Line Items]
Interest rate											5.15%
Senior Notes | Senior Notes Axis Specialty Finance PLC 2017
Debt Instrument [Line Items]
Interest rate										4.00%
Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate							4.90%
Interest expense				$ 1,000,000
Aggregate Principal							$ 425,000,000
AXIS Specialty Finance LLC
Debt Instrument [Line Items]
Percentage ownership in subsidiary				100.00%				100.00%		100.00%	100.00%	100.00%
London Interbank Offered Rate (LIBOR) | Dekania Notes, 15 Million
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
London Interbank Offered Rate (LIBOR) | Dekania Notes, 11 Million
Debt Instrument [Line Items]
Basis spread on variable rate		4.05%
London Interbank Offered Rate (LIBOR) | Dekania Notes, 10 Million
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
AXIS Specialty Finance LLC | Senior Notes | 3.9% Senior Notes
Debt Instrument [Line Items]
Interest rate								3.90%

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