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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent                 (18.00%)      
Increase (decrease) in deferred tax asset valuation allowance                 $ 13.9 $ 3.1    
Operating Loss Carryforwards                       $ 749.2
Deferred Tax Assets, Operating Loss Carryforwards $ 211.1       $ 190.9       211.1 190.9    
Provision (benefit) for income taxes 0.8 $ 0.2 $ 0.5 $ (0.1) (0.4) $ 0.0 $ 0.0 $ 0.1 1.4 (0.3)    
Liability for Uncertain Tax Positions, Noncurrent 0.8       $ 0.4       0.8 0.4 $ 0.2  
Income Tax Examination, Penalties and Interest Expense Reduction                 (0.1)      
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction                 (0.4) $ (0.2)    
Income Tax Examination, Penalties and Interest Accrued 0.1               $ 0.1      
Federal Statutory Income Tax Rate, Percent                 21.00% 21.00%    
State and Local Jurisdiction [Member]                        
Deferred Tax Asset, Increase (Decrease), Amount                 $ 39.5      
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent                 (1.00%) 1.00%    
Increase (decrease) in deferred tax asset valuation allowance                 $ 2.0      
Operating Loss Carryforwards 3.9               3.9      
Deferred Tax Assets, Operating Loss Carryforwards 454.6               454.6      
Tax Year 2018 [Member]                        
Operating Loss Carryforwards 131.4               131.4      
Business Interest Expense Carryforward $ 11.2               $ 11.2