REVENUE RECOGNITION - Transaction price allocated to the remaining performance obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Customer Frequency Program
Deferred revenues and income	$ 421.8	$ 402.7
Gift Card And Ticket Exchange
Customer Frequency Program
Redemption period	24 months
Deferred revenues and income	$ 326.3
Loyalty Program
Customer Frequency Program
Redemption period	24 months
Deferred revenues and income	$ 73.6
Exhibitor Services Agreement
Customer Frequency Program
Expected to be recognized as revenue	486.6
Exhibitor Services Agreement \| Year Ended 2024
Customer Frequency Program
Expected to be recognized as revenue	22.7
Exhibitor Services Agreement \| Year Ended 2025
Customer Frequency Program
Expected to be recognized as revenue	24.4
Exhibitor Services Agreement \| Year Ended 2026
Customer Frequency Program
Expected to be recognized as revenue	26.2
Exhibitor Services Agreement \| Year Ended 2027
Customer Frequency Program
Expected to be recognized as revenue	28.2
Exhibitor Services Agreement \| Year Ended 2028
Customer Frequency Program
Expected to be recognized as revenue	30.4
Exhibitor Services Agreement \| Years ended 2029 through February 2037
Customer Frequency Program
Expected to be recognized as revenue	$ 354.7