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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2022
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]                  
Loss before income taxes $ (58.3) $ (66.4) $ (95.5) $ (77.5) $ (173.0) $ (239.4) $ (297.7) $ (521.1) $ (363.0)
Amount                  
Statutory U.S. federal income tax benefit             (62.5) (109.4) (76.2)
Valuation allowance on deferred tax assets             65.8 116.7 61.5
Warrants fair value adjustment             0.0 0.0 11.5
Share-based compensation             4.9 (3.3) 5.0
Nondeductible compensation             $ 1.3 $ 1.8 $ 0.0
Return to provision permanent adjustments             1.20% 0.10% 0.00%
State net operating loss             $ (7.1) $ (4.9) $ (3.1)
Other             1.1 (0.4) 1.3
Total income tax expense (benefit) $ 0.0 $ 0.0 $ 0.0 $ 0.0     $ 0.0 $ 0.0 $ 0.0
Percent                  
Statutory U.S. federal income tax benefit             21.00% 21.00% 21.00%
Valuation allowance on deferred tax assets             (22.10%) (22.40%) (16.90%)
Warrants fair value adjustment             0.00% 0.00% (3.20%)
Share-based compensation             (1.60%) 0.60% (1.40%)
Nondeductible compensation             (0.40%) (0.30%) 0.00%
Return to provision permanent adjustments             $ (3.5) $ (0.5) $ 0.0
State net operating loss             2.40% 0.90% 0.90%
Other             (0.50%) 0.10% (0.40%)
Income tax expense (benefit)             0.00% 0.00% 0.00%