LEASES - Narrative (Details) ft² in Thousands, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2024 USD ($) installment	Sep. 30, 2024 USD ($) ft² term	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) ft² term	Sep. 30, 2023 USD ($)	Sep. 01, 2024
Leases
Right of use assets obtained in exchange for lease liabilities		$ 20.1	$ 11.7	$ 20.4	$ 14.8
Additional operating lease liabilities		20.1
Gain on lease termination				0.7	$ 0.0
Minimum lease payments		$ 193.7		193.7
Office Space in Lenexa, Kansas
Leases
Reduction fee	$ 1.3			1.3
Number of installments, reduction fee payable | installment	2
Right of use asset, decrease due to reduction in lease term				10.3
Decrease in operating lease of lease liabilities due to reduction in lease term				$ 11.0
Office Space in Overland Park, Kansas
Leases
Renewal term		60 months		60 months
Square feet of office space | ft²		60		60
Term of contract						129 months
Number of terms available to renew | term		2		2
Minimum lease payments		$ 12.0		$ 12.0
Other income | Office Space in Lenexa, Kansas
Leases
Gain on lease termination				$ 0.7
Minimum
Leases
Renewal term		1 year		1 year
Maximum
Leases
Renewal term		5 years		5 years
Option to terminate period (in years)				1 year