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Income Taxes - Expected Expirations of Federal and State Losses and Credits (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2018
Federal    
Expirations of Operating Loss Carryforwards, Components [Abstract]    
2025 $ 16.0  
2026 17.1  
2027 6.1  
2028 and thereafter 245.9  
Indefinite 801.9  
Total 1,087.0 $ 801.9
State    
Expirations of Operating Loss Carryforwards, Components [Abstract]    
2025 5.2  
2026 7.1  
2027 1.9  
2028 and thereafter 333.6  
Indefinite 0.7  
Total 348.5  
Foreign Tax Jurisdiction    
Expirations of Operating Loss Carryforwards, Components [Abstract]    
2025 0.0  
2026 0.0  
2027 0.0  
2028 and thereafter 1.0  
Indefinite 0.0  
Total 1.0  
Research Tax Credit Carryforward | Federal    
Expirations of Tax Credit Carryforwards [Abstract]    
2025 0.0  
2026 0.0  
2027 0.0  
2028 and thereafter 46.1  
Indefinite 0.0  
Total 46.1  
Research Tax Credit Carryforward | State    
Expirations of Tax Credit Carryforwards [Abstract]    
2025 0.0  
2026 0.0  
2027 0.0  
2028 and thereafter 0.0  
Indefinite 7.9  
Total $ 7.9