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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]    
Amortization of pension related costs, tax expense $ 0.0 $ 0.0
Pension settlement and curtailment, tax expense 0.0 0.0
Pension re-measurement, tax expense $ 0.3 $ 0.3