SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
HG Global-BAM
SUPPLEMENTARY INSURANCE INFORMATION
Deferred Acquisition Costs	$ 36.0	$ 33.1	$ 27.8
Future Policy Benefits, Losses, Claims and Loss Expenses	0.0	0.0	0.0
Unearned Premiums	298.3	266.3	237.5
Other Policy Claims and Benefits Payable	0.0	0.0	0.0
Premiums Earned	33.3	26.9	22.8
Net Investment Income	21.5	17.5	19.5
Benefits, Claims, Losses and Settlement Expenses	0.0	0.0	0.0
Amortization of Deferred Acquisition Costs	11.2	8.3	7.0
Other Operating Expenses	0.4	0.4	0.4
Premiums Written	65.1	55.8	$ 61.7
Ark
SUPPLEMENTARY INSURANCE INFORMATION
Deferred Acquisition Costs	127.2	100.8
Future Policy Benefits, Losses, Claims and Loss Expenses	1,296.5	894.7
Unearned Premiums	623.2	495.9
Other Policy Claims and Benefits Payable	0.0	0.0
Premiums Earned	1,043.4	637.3
Net Investment Income	16.3	2.9
Benefits, Claims, Losses and Settlement Expenses	536.4	314.8
Amortization of Deferred Acquisition Costs	238.3	111.3
Other Operating Expenses	78.7	64.6
Premiums Written	$ 1,195.2	$ 859.1