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Consolidated Statement of Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Class A
Class B
Common Shares
Class A
Common Shares
Class B
Additional Paid in Capital
Additional Paid in Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Class B Common Treasury Shares
Beginning balance (in shares) at Dec. 31, 2022         50,000 16,184,264          
Beginning balance at Dec. 31, 2022 $ 206.0           $ 585.9   $ (375.6)   $ (4.3)
Beginning balance (in shares) at Dec. 31, 2022                     123,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Rights offering, net of costs (in shares)           18,181,818          
Rights offering, net of costs 98.4           98.4        
Stock-based compensation (in shares)           705,873          
Stock-based compensation 12.0           12.0        
Tax withholding for vesting of restricted stock units and other (1.4)           (1.4)        
Issuance of warrant 6.1           6.1        
Net loss (215.5)               (215.5)    
Ending balance (in shares) at Dec. 31, 2023     50,000 35,071,955 50,000 35,071,955          
Ending balance at Dec. 31, 2023 $ 105.6 $ (3.7)         701.0 $ (13.5) (591.1) $ 9.8 $ (4.3)
Ending balance (in shares) at Dec. 31, 2023 123,089                   123,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Accounting standards update extensible enumeration Accounting Standards Update 2020-06 [Member]                    
Rights offering, net of costs (in shares)           2,392,344          
Rights offering, net of costs $ 9.1           9.1        
Stock-based compensation (in shares)           253,543          
Stock-based compensation 4.6           4.6        
Other (0.3)           (0.3)        
Net loss (78.6)               (78.6)    
Ending balance (in shares) at Dec. 31, 2024     50,000 37,717,842 50,000 37,717,842          
Ending balance at Dec. 31, 2024 $ 36.7           $ 700.9   $ (659.9)   $ (4.3)
Ending balance (in shares) at Dec. 31, 2024 123,089                   123,089