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DEBT AND FINANCING ARRANGEMENTS - Debt (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 10, 2019	Jun. 19, 2019	Dec. 06, 2017	Mar. 13, 2014
Debt Instrument [Line Items]
Debt		$ 1,309,695	$ 1,808,157
Repayment of notes payable		500,000	250,000	$ 0
AXIS Specialty Finance PLC
Debt Instrument [Line Items]
Percentage ownership in subsidiary	100.00%
Senior Notes
Debt Instrument [Line Items]
Interest expense		52,000	67,000	$ 64,000
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Interest rate	5.875%							5.875%
Debt		0	499,687
Senior Notes | 5.150% Senior Notes
Debt Instrument [Line Items]
Interest rate								5.15%
Debt		246,559	246,491
Senior Notes | 4.000% Senior Notes
Debt Instrument [Line Items]
Interest rate							4.00%
Debt		347,324	346,997
Senior Notes | 3.900% Senior Notes
Debt Instrument [Line Items]
Interest rate						3.90%
Debt		295,748	295,339
Senior Notes | AXIS Specialty Finance PLC | 5.875% Senior Notes
Debt Instrument [Line Items]
Repayment of notes payable	$ 500,000
Junior Subordinated Notes
Debt Instrument [Line Items]
Interest rate					4.90%
Debt		420,064	419,643
Interest expense		$ 21,000	$ 1,000

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