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LEASES - Narrative (Details) ft² in Thousands, $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2024 USD ($) installment	Dec. 31, 2024 USD ($) ft² term	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2024 ft²	Sep. 01, 2024
Leases
Option to terminate period (in years)		1 year
Right of use assets obtained in exchange for lease liabilities		$ 26.7	$ 44.5
Additional operating lease liabilities		26.7
Minimum lease payments		183.4
Office Space In Lenexa, Kansas
Leases
Reduction fee	$ 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 (in years)		60 months
Square feet of office space | ft²		60			60
Term of contract (in years)						129 months
Number of terms available to renew | term		2
Minimum lease payments		$ 12.0
Minimum
Leases
Renewal term (in years)		1 year
Maximum
Leases
Renewal term (in years)		5 years
Option to terminate period (in years)		1 year
Other Income | Office Space In Lenexa, Kansas
Leases
Gain on lease termination		$ 0.7
Technology support services
Leases
Rent expense		$ 37.1	$ 34.5	$ 30.0

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