SCHEDULE IV REINSURANCE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums earned
Net earned premiums	$ 1,076.7	$ 664.2	$ 22.8
HG Global/BAM
Premiums earned
Gross Amount	28.6	23.2	19.4
Ceded to Other Companies	0.0	0.0	0.0
Assumed from Other Companies	4.7	3.7	3.4
Net earned premiums	$ 33.3	$ 26.9	$ 22.8
Percentage of Amount Assumed to Net	14.10%	13.80%	14.90%
Ark
Premiums earned
Gross Amount	$ 655.5	$ 556.0
Ceded to Other Companies	(280.8)	(249.1)
Assumed from Other Companies	668.7	330.4
Net earned premiums	$ 1,043.4	$ 637.3	$ 0.0
Percentage of Amount Assumed to Net	64.10%	51.80%