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DEBT AND FINANCING ARRANGEMENTS - Debt (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 10, 2019	Jun. 19, 2019	Dec. 06, 2017	Mar. 13, 2014	Mar. 23, 2010
Debt Instrument [Line Items]
Debt		$ 1,808,157	$ 1,341,961
Repayment of notes payable		250,000	0	$ 67,242
AXIS Specialty Finance PLC
Debt Instrument [Line Items]
Percentage ownership in subsidiary	100.00%
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Debt		499,687	498,967
Interest rate									5.875%
Senior Notes | 2.650% Senior Notes
Debt Instrument [Line Items]
Debt		0	249,885
Senior Notes | 5.150% Senior Notes
Debt Instrument [Line Items]
Debt		246,491	246,425
Interest rate								5.15%
Senior Notes | 4.000% Senior Notes
Debt Instrument [Line Items]
Debt		346,997	346,684
Interest rate							4.00%
Senior Notes | 3.900% Senior Notes
Debt Instrument [Line Items]
Debt		295,339	0
Interest rate						3.90%
Senior Notes | 2010 AXIS Specialty Finance LLC Senior Notes
Debt Instrument [Line Items]
Interest rate	2.65%								5.875%
Senior Notes | AXIS Specialty Finance PLC | 2.65% Senior Notes
Debt Instrument [Line Items]
Repayment of notes payable	$ 250,000
Junior Subordinated Notes
Debt Instrument [Line Items]
Debt		$ 419,643	$ 0
Interest rate					4.90%

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