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REVENUE RECOGNITION - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]      
Deferred revenue $ 3.5 $ 11.2 $ 18.0
Deferred contract acquisition costs 8.0 6.3  
Amortization of deferred contract acquisition costs 10.5 $ 15.3 $ 20.4
Variable consideration from unredeemed vouchers sold in prior periods $ 31.4