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DEBT AND FINANCING ARRANGEMENTS - Debt terms (Details) - USD ($)	Dec. 10, 2019	Jun. 19, 2019	Dec. 06, 2017	Mar. 13, 2014	Jun. 01, 2020
Senior Notes | 5.150% Senior Notes
Debt Instrument [Line Items]
Interest rate				5.15%
Aggregate Principal				$ 250,000,000
Issue Price				99.474%
Net Proceeds				$ 246,000,000
Senior Notes | 4.000% Senior Notes
Debt Instrument [Line Items]
Interest rate			4.00%
Aggregate Principal			$ 350,000,000
Issue Price			99.78%
Net Proceeds			$ 347,000,000
Senior Notes | 3.900% Senior Notes
Debt Instrument [Line Items]
Interest rate		3.90%
Aggregate Principal		$ 300,000,000
Issue Price		99.36%
Net Proceeds		$ 296,000,000
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%
Senior Notes | 3.9% Senior Notes | AXIS Specialty Finance LLC
Debt Instrument [Line Items]
Interest rate		3.90%
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Interest rate				5.875%	5.875%
Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	4.90%
Aggregate Principal	$ 425,000,000
Issue Price	99.00%
Net Proceeds	$ 420,750,000
Junior Subordinated Notes | AXIS Specialty Finance LLC
Debt Instrument [Line Items]
Interest rate		4.90%
Junior Subordinated Notes | Five-Year Treasury Rate
Debt Instrument [Line Items]
Basis spread on variable rate	3.186%

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