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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (decrease) in deferred tax asset valuation allowance $ (11.7) $ (7.7)      
Operating Loss Carryforwards     $ 534.6    
Operating Loss Carryforwards, No Expiration     131.4    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount     16.6 $ 31.7 $ 0.6
Provision (benefit) for income taxes     0.2 (0.1) (15.6)
Liability for Uncertain Tax Positions, Noncurrent 2.9   3.4 2.9 $ 1.9
Income Tax Examination, Penalties and Interest Expense Reduction     (0.3) (0.2)  
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction     (0.5) (1.0)  
Income Tax Examination, Penalties and Interest Accrued 0.3   $ 0.5 $ 0.3  
Federal Statutory Income Tax Rate, Percent     21.00% 21.00% 21.00%
Deferred Tax Assets, Valuation Allowance $ 382.4   $ 365.7 $ 382.4  
Domestic Tax Jurisdiction [Member]          
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount       $ 19.4  
State and Local Jurisdiction [Member]          
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent     0.00% 15.00% 2.00%
Operating Loss Carryforwards, Valuation Allowance     $ 493.5    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount       $ (12.3)  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount       $ 12.1