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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 |  |  |

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