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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]      
Increase (Decrease) in Effective Tax Rate (37.90%) 30.20%  
Deferred Tax Assets, Operating Loss Carryforwards $ 545.9 $ 608.5  
Deferred Tax Assets, Valuation Allowance 7.8 6.4  
Unrecognized Tax Benefits, Income Tax Penalties Expense 0.0 0.0 $ 0.0
Unrecognized Tax Benefits, Income Tax Penalties Accrued 0.0 $ 0.0  
Massachusetts Business [Domain]      
Income Taxes [Line Items]      
Deferred Tax Assets, Valuation Allowance 7.8    
Internal Revenue Service (IRS)      
Income Taxes [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards 464.4    
State and Local Jurisdiction      
Income Taxes [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards $ 73.7